Word list
15 Letter Words
A complete list of 5,812 fifteen-letter words, ordered with the most common first. Use the finder to narrow them by the letters you have.
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Quick answer
How many 15 letter words are there?
There are 5,812 fifteen-letter words in this dictionary of English. The most common include DIFFERENTIATION, EXPERIMENTATION, INDIVIDUALISTIC, INSTRUMENTALITY, INSTRUMENTATION, and one of the highest-scoring is OXYPHENBUTAZONE at 41 points.
- Total words
- 5,812
- Word length
- 15 letters
- Top score
- 41 pts
- Most common
- DIFFERENTIATION
Common 15 letter words
Showing the 600 most common of 5,812. Click any word for its definition, score and anagrams.
- differentiation22
- experimentation26
- individualistic22
- instrumentality20
- instrumentation17
- misconstruction21
- straightforward26
- confidentiality24
- conventionalize29
- distinguishable22
- diversification24
- ecclesiasticism23
- experimentalism28
- incompatibility26
- inconsequential26
- insignificantly24
- insubordination18
- intensification20
- invulnerability23
- microscopically28
- objectification31
- parasympathetic29
- personification22
- philosophically30
- procrastination19
- proportionality22
- proportionately22
- psychologically31
- rationalization24
- reconsideration18
- resourcefulness20
- supernaturalism19
- sympathetically30
- ultracentrifuge21
- unconditionally21
- acknowledgement28
- antepenultimate19
- anticholinergic23
- appropriateness21
- comfortableness24
- complementarity26
- complementation23
- conspicuousness21
- consubstantiate19
- contemporaneity24
- contemporaneous21
- conventionality23
- crystallization29
- destabilization27
- detribalisation18
- detribalization27
- disorganisation17
- disorganization26
- distastefulness19
- distinctiveness21
- dolichocephalic30
- electrification22
- emotionlessness17
- enfranchisement25
- entrepreneurial17
- excommunication30
- exemplification31
- externalisation22
- externalization31
- extracurricular26
- hermaphroditism28
- hospitalization29
- hypercatalectic29
- impenetrability24
- impressionistic21
- inattentiveness18
- incommensurable23
- indemnification23
- injudiciousness25
- intemperateness19
- interchangeable23
- interconnection19
- interrogatively22
- intussusception19
- materialisation17
- materialization26
- meaninglessness18
- mischievousness25
- nationalisation15
- nationalization24
- neurobiological20
- parliamentarian19
- parthenogenesis21
- perpendicularly25
- picturesqueness28
- precipitousness21
- pretentiousness17
- professionalise20
- professionalize29
- prognostication20
- psychopathology34
- radiotelegraphy25
- rationalisation15
- restrictiveness20
- speculativeness22
- standardisation17
- standardization26
- supplementation21
- synchronisation23
- synchronization32
- synergistically24
- telephotography29
- tempestuousness19
- thoughtlessness22
- totalitarianism17
- transfiguration19
- transplantation17
- unaccommodating25
- uncomplimentary26
- unimaginatively24
- unobjectionable28
- unpronounceable21
- unsophisticated23
- warmheartedness24
- anthropomorphic29
- authoritatively24
- bibliographical27
- chromatographic30
- chronologically26
- communicational23
- compassionately24
- comprehensively30
- congratulations18
- contradictorily23
- correspondingly24
- counterbalanced22
- counterproposal21
- crystallography29
- disconcertingly24
- disillusionment18
- dispassionately21
- dissatisfaction21
- electromagnetic22
- electrophoresis22
- expressionistic26
- extraordinarily26
- instrumentalist17
- interdependence21
- internationally18
- intramuscularly22
- kinesthetically27
- macroscopically28
- maneuverability25
- micrometeoritic23
- morphophonemics31
- noncommissioned22
- noninterference20
- nonspecifically27
- notwithstanding23
- overachievement28
- oxytetracycline32
- particularistic21
- pharmacological27
- physicochemical34
- plainclothesman24
- polycrystalline25
- polyelectrolyte25
- reproducibility25
- surreptitiously20
- systematization29
- technologically26
- underprivileged23
- understandingly21
- unintentionally18
- uninterruptedly21
- unquestioningly28
- unrealistically20
- unreconstructed20
- unselfconscious22
- acanthocephalan27
- acclimatisation21
- acclimatization30
- accommodatingly28
- accommodational24
- acculturational19
- acetophenetidin23
- achondroplastic25
- acknowledgeable28
- acquisitiveness29
- adenohypophysis32
- adventurousness19
- agranulocytosis21
- agriculturalist18
- alphabetisation22
- alphabetization31
- amphitheatrical27
- anisotropically22
- anthropocentric24
- anthropogenesis21
- anthropogenetic23
- anthropological23
- anthropophagite26
- anthropophagous26
- anticlimactical23
- approachability29
- arboriculturist19
- archaebacterium26
- architecturally25
- argumentatively24
- asclepiadaceous22
- astronavigation19
- atherosclerosis20
- atherosclerotic22
- autoradiography25
- bacteriological22
- bacteriophagous25
- basidiomycetous25
- biogeographical26
- bioluminescence23
- blameworthiness25
- boustrophedonic25
- brachycephalism34
- brachydactylous31
- cardiopulmonary25
- catheterisation20
- catheterization29
- centrosymmetric26
- cephalochordate28
- cerebrovascular24
- ceremoniousness19
- chloramphenicol29
- cholangiography30
- cholecalciferol27
- cholecystectomy32
- cholecystokinin29
- chorioallantois20
- churrigueresque30
- cinematographer25
- circularisation19
- circularization28
- circumferential24
- circumscription25
- circumstantiate21
- coldheartedness22
- combustibleness23
- commonplaceness25
- competitiveness24
- complicatedness24
- compressibility26
- comptrollership26
- computationally24
- computerization30
- conceivableness24
- conceptualistic23
- condescendingly25
- configurational21
- confrontational20
- connoisseurship22
- conscientiously22
- consequentially29
- conservationist20
- considerateness18
- contemptibility26
- contentiousness17
- contraclockwise28
- controversially23
- conventionalise20
- conventionalism22
- conversationist20
- cooperativeness22
- corynebacterium26
- counteractively25
- counterargument20
- counterirritant17
- criminalisation19
- criminalization28
- crossopterygian23
- cryptographical30
- crystallisation20
- cylindricalness23
- cytomegalovirus26
- cytophotometric29
- cytoplasmically29
- decalcification25
- decarboxylation30
- decontamination20
- dedifferentiate23
- defencelessness21
- defenselessness19
- demagnetisation19
- demagnetization28
- democratisation20
- democratization29
- demonstrability23
- demonstratively24
- dermatoglyphics29
- dermatomyositis23
- dermatophytosis26
- desensitisation16
- desensitization25
- desertification21
- dessertspoonful21
- destabilisation18
- destructibility23
- destructiveness21
- determinateness18
- developmentally26
- diagonalisation17
- diagonalization26
- dichloromethane26
- dichotomisation23
- dichotomization32
- diphenhydramine30
- disadvantageous21
- disappointingly24
- discombobulated25
- discontinuation18
- disenfranchised25
- disentanglement19
- disgracefulness22
- disinterestedly20
- dispensableness20
- disproportional20
- disreputability23
- disrespectfully26
- dissatisfactory24
- distressfulness19
- distrustfulness19
- domineeringness19
- downheartedness23
- efficaciousness25
- electrochemical26
- electromyograph28
- electronegative21
- electrophoretic24
- electropositive22
- emancipationist21
- enantiomorphism24
- encephalography31
- endocrinologist19
- environmentally23
- epidemiological23
- episcopalianism23
- epistemological22
- equalitarianism26
- euphemistically27
- everlastingness19
- exchangeability33
- exhibitionistic29
- expeditiousness25
- extemporisation26
- extemporization35
- exteriorisation22
- exteriorization31
- extralinguistic25
- familiarisation20
- familiarization29
- flibbertigibbet27
- foresightedness23
- forthcomingness26
- gastroenteritis16
- grandiloquently29
- gravitationally22
- gynandromorphic29
- haemagglutinate22
- haemoglobinuria23
- hardheartedness23
- hemochromatosis27
- hereditarianism21
- heterosexuality28
- hexachlorophene35
- historiographer24
- homogeneousness21
- horticulturally23
- hospitalisation20
- humanitarianism22
- hyperadrenalism26
- hyperlipidaemia28
- hypersensitised24
- hypersensitized33
- hyperthyroidism32
- hypochondriacal31
- hypochondriasis29
- hypostatisation23
- hypostatization32
- ideographically27
- ignominiousness18
- illustriousness15
- imaginativeness21
- immunochemistry29
- immunocompetent25
- immunodeficient25
- immunologically25
- immunopathology28
- impecuniousness21
- imperishability27
- impermeableness23
- implausibleness21
- inaccessibility24
- inadmissibility23
- inapplicability26
- inappropriately24
- incommunicative26
- incommutability26
- incomprehension24
- incomprehensive27
- incongruousness18
- inconsiderately21
- inconsideration18
- inconspicuously24
- indetermination18
- indigestibility22
- indisputability23
- industriousness16
- ineffectiveness26
- ineffectualness23
- inefficaciously28
- inexpensiveness27
- innumerableness19
- inopportuneness19
- inquisitiveness27
- insensitiveness18
- inspirationally20
- instantaneously18
- institutionally18
- instrumentalism19
- insubstantially20
- insurrectionary20
- insurrectionism19
- insurrectionist17
- intelligibility21
- interchangeably26
- intercollegiate18
- interdependency24
- interestingness16
- internalisation15
- internalization24
- interscholastic22
- intractableness19
- involuntariness18
- irreligiousness16
- irresistibility20
- irreversibility23
- jurisprudential25
- kindheartedness24
- lackadaisically27
- lepidopterology24
- lexicographical32
- logarithmically26
- longsightedness21
- lymphadenopathy34
- lymphocytopenia32
- lymphogranuloma28
- macrosporangium24
- magnanimousness20
- malacopterygian25
- manoeuvrability25
- marginalisation18
- marginalization27
- marriageability23
- masculinisation19
- masculinization28
- masochistically27
- mechanistically27
- megagametophyte29
- memorialisation19
- memorialization28
- merchantability27
- meritoriousness17
- metamathematics26
- methamphetamine29
- methylphenidate29
- microelectronic23
- micromillimetre23
- microphotometer26
- microsporangium24
- microsporophyll29
- miniaturisation17
- miniaturization26
- misapprehension24
- misappropriated24
- monounsaturated18
- morphologically28
- multiprocessing22
- musculoskeletal23
- musicologically25
- mythologisation24
- mythologization33
- nearsightedness20
- neighbourliness21
- neoconservatism22
- neoconservative23
- neuroanatomical19
- neurohypophysis31
- neurophysiology27
- neuropsychiatry28
- neuropsychology29
- nitrochloroform25
- nonhierarchical25
- noninflammatory25
- nonintellectual17
- nonintersecting18
- nonintervention18
- nonpartisanship22
- nonprescription21
- nonprofessional20
- nontransferable20
- northeastwardly25
- northwestwardly28
- nucleosynthesis23
- numismatologist20
- oligodendrocyte23
- oligodendroglia19
- oligonucleotide19
- oligosaccharide24
- omnidirectional20
- ophthalmologist26
- ophthalmoplegia28
- opisthognathous24
- organophosphate26
- ornithorhynchus29
- overbearingness21
- overutilisation18
- overutilization27
- oxyphenbutazone41
- painstakingness22
- palaeogeography27
- palaeontologist18
- palaeopathology26
- paleontological20
- parenthetically25
- parthenogenetic23
- perfluorocarbon24
- perspicuousness21
- pessimistically24
- phenolphthalein28
- phenylketonuria27
- phosphocreatine27
- phosphorescence29
- photoconduction25
- photoconductive28
- photoelectrical24
- photojournalism29
- photojournalist27
- photolithograph29
- photomechanical29
- photometrically27
- photomicrograph30
- physiologically29
- physiotherapist28
- pithecanthropus27
- platitudinarian18
- plenipotentiary22
- pleuropneumonia21
- plumbaginaceous24
- polyunsaturated21
- postoperatively25
- practicableness23
- precipitateness21
- prepositionally22
- presbyterianism24
- preservationist20
- prestidigitator19
- prestigiousness18
- preternaturally20
- problematically26
- professionalism22
- prognosticative23
- progressiveness21
- promiscuousness21
- protozoological29
- pseudoephedrine24
- psychophysicist35
- psychosexuality35
- psychotherapist30
- pulchritudinous23
- punctiliousness19
- purposelessness19
- pusillanimously22
- pycnodysostosis26
- pyroelectricity27
- quarrelsomeness26
- quatercentenary29
- radiomicrometer22
- radioprotection20
- radiotelephonic23
- reapportionment21
- redetermination18
- repetitiousness17
- responsibleness19
- retrospectively25
- rhombencephalon29
- roentgenography25
- romanticisation19
- romanticization28
- sadomasochistic25
- sanctimoniously22
- schistosomiasis22
- semiterrestrial17
- semitransparent19
- serviceableness22
- servomechanical27
- sidesplittingly22
- sociobiological22
- sociolinguistic20
Highest-scoring 15 letter words
The fifteen-letter words worth the most in Scrabble, before premium squares and before the 50-point bingo bonus for using all seven tiles.
| Word | Scrabble | Words With Friends |
|---|---|---|
| QUIZZIFICATIONS | 47 | 50 |
| OXYPHENBUTAZONE | 41 | 44 |
| METHOXYBENZENES | 41 | 43 |
| NEBUCHADNEZZARS | 41 | 45 |
| PHOTOXYLOGRAPHY | 39 | 39 |
| BENZODIAZEPINES | 38 | 42 |
| CHROMOXYLOGRAPH | 38 | 40 |
| PSYCHOANALYZING | 38 | 41 |
| QUINQUEVALENCES | 38 | 45 |
| XYLOTYPOGRAPHIC | 38 | 40 |
| ZYGOPHYLLACEOUS | 38 | 41 |
| APOPHTHEGMATIZE | 37 | 39 |
| CYCLOHEXYLAMINE | 37 | 40 |
| HYDROXYBUTYRATE | 37 | 35 |
| HYPERCRITICIZED | 37 | 38 |
15 letter words starting with each letter
The most common fifteen-letter words for every starting letter, with how many there are.
15 letter words starting with A
375 words
- acknowledgement28
- antepenultimate19
- anticholinergic23
- appropriateness21
- anthropomorphic29
- authoritatively24
- acanthocephalan27
- acclimatisation21
15 letter words starting with B
120 words
- bibliographical27
- bacteriological22
- bacteriophagous25
- basidiomycetous25
- biogeographical26
- bioluminescence23
- blameworthiness25
- boustrophedonic25
15 letter words starting with C
578 words
- confidentiality24
- conventionalize29
- comfortableness24
- complementarity26
- complementation23
- conspicuousness21
- consubstantiate19
- contemporaneity24
15 letter words starting with D
446 words
- differentiation22
- distinguishable22
- diversification24
- destabilization27
- detribalisation18
- detribalization27
- disorganisation17
- disorganization26
15 letter words starting with E
268 words
- experimentation26
- ecclesiasticism23
- experimentalism28
- electrification22
- emotionlessness17
- enfranchisement25
- entrepreneurial17
- excommunication30
15 letter words starting with F
90 words
- familiarisation20
- familiarization29
- flibbertigibbet27
- foresightedness23
- forthcomingness26
- facetiousnesses20
- factorabilities22
- faithlessnesses21
15 letter words starting with G
89 words
- gastroenteritis16
- grandiloquently29
- gravitationally22
- gynandromorphic29
- galactopoietics22
- galvanometrical23
- galvanoplasties21
- galvanotropisms23
15 letter words starting with H
235 words
- hermaphroditism28
- hospitalization29
- hypercatalectic29
- haemagglutinate22
- haemoglobinuria23
- hardheartedness23
- hemochromatosis27
- hereditarianism21
15 letter words starting with I
497 words
- individualistic22
- instrumentality20
- instrumentation17
- incompatibility26
- inconsequential26
- insignificantly24
- insubordination18
- intensification20
15 letter words starting with J
6 words
- jurisprudential25
- journalisations22
- journalizations31
- judiciousnesses25
- justifiableness27
- juxtapositional31
15 letter words starting with K
17 words
- kinesthetically27
- kindheartedness24
- kaffeeklatsches34
- karstifications24
- katathermometer26
- kenogenetically25
- keratinisations19
- keratinizations28
15 letter words starting with L
84 words
- lackadaisically27
- lepidopterology24
- lexicographical32
- logarithmically26
- longsightedness21
- lymphadenopathy34
- lymphocytopenia32
- lymphogranuloma28
15 letter words starting with M
342 words
- misconstruction21
- microscopically28
- materialisation17
- materialization26
- meaninglessness18
- mischievousness25
- macroscopically28
- maneuverability25
15 letter words starting with N
219 words
- nationalisation15
- nationalization24
- neurobiological20
- noncommissioned22
- noninterference20
- nonspecifically27
- notwithstanding23
- nearsightedness20
15 letter words starting with O
235 words
- objectification31
- overachievement28
- oxytetracycline32
- oligodendrocyte23
- oligodendroglia19
- oligonucleotide19
- oligosaccharide24
- omnidirectional20
15 letter words starting with P
669 words
- parasympathetic29
- personification22
- philosophically30
- procrastination19
- proportionality22
- proportionately22
- psychologically31
- parliamentarian19
15 letter words starting with Q
29 words
- quarrelsomeness26
- quatercentenary29
- quadragenarians26
- quadringenaries26
- quadripartition27
- quadrisyllables30
- quadrivalencies30
- quadruplicating30
15 letter words starting with R
328 words
- rationalization24
- reconsideration18
- resourcefulness20
- radiotelegraphy25
- rationalisation15
- restrictiveness20
- reproducibility25
- radiomicrometer22
15 letter words starting with S
522 words
- straightforward26
- supernaturalism19
- sympathetically30
- speculativeness22
- standardisation17
- standardization26
- supplementation21
- synchronisation23
15 letter words starting with T
267 words
- telephotography29
- tempestuousness19
- thoughtlessness22
- totalitarianism17
- transfiguration19
- transplantation17
- technologically26
- telegraphically26
15 letter words starting with U
295 words
- ultracentrifuge21
- unconditionally21
- unaccommodating25
- uncomplimentary26
- unimaginatively24
- unobjectionable28
- unpronounceable21
- unsophisticated23
15 letter words starting with V
55 words
- vascularisation20
- vascularization29
- vasoconstrictor22
- venturesomeness20
- voyeuristically26
- valetudinarians19
- valuelessnesses18
- vapourabilities22
15 letter words starting with W
28 words
- warmheartedness24
- weatherboarding25
- whatchamacallit30
- wappenschawings31
- warrantableness20
- wasterfulnesses21
- watercolourists20
- waterlessnesses18
15 letter words starting with X
5 words
- xeroradiography32
- xenomorphically34
- xenotransplants24
- xerographically33
- xylotypographic38
15 letter words starting with Y
2 words
- yellowishnesses24
- yieldablenesses21
15 letter words starting with Z
11 words
- zigzaggednesses37
- zinckifications35
- zinjanthropuses36
- zoogeographical33
- zoophysiologies33
- zoophysiologist33
- zoophytological35
- zoophytologists33
Common endings for 15 letter words
The 3-letter endings shared by the most fifteen-letter words. Spotting an ending in your rack is the fastest route to a long play.
15 letter words ending in SES
720 words
- acceptingnesses22
- accessarinesses19
- accessorinesses19
- adaptablenesses20
- adenohypophyses32
- admirablenesses20
- adversarinesses19
- advisablenesses21
- affectivenesses26
- aggregatenesses18
15 letter words ending in ONS
548 words
- congratulations18
- administrations18
- aerosolisations15
- aerosolizations24
- aftersensations18
- alcoholisations20
- alcoholizations29
- alexipharmakons33
- alkalinisations19
- alkalinizations28
15 letter words ending in IES
543 words
- aboriginalities18
- absorbabilities21
- acceptabilities23
- accessibilities21
- accidentalities20
- accidentologies21
- achromaticities24
- acquirabilities28
- actinobiologies20
- actinotherapies22
15 letter words ending in ION
378 words
- differentiation22
- experimentation26
- instrumentation17
- misconstruction21
- diversification24
- insubordination18
- intensification20
- objectification31
- personification22
- procrastination19
15 letter words ending in ESS
357 words
- resourcefulness20
- appropriateness21
- comfortableness24
- conspicuousness21
- distastefulness19
- distinctiveness21
- emotionlessness17
- inattentiveness18
- injudiciousness25
- intemperateness19
Fifteen-letter words with Q, Z, X and J
The high-value tiles. A fifteen-letter word that uses one is usually the top-scoring play on the rack.
15 letter words with Q
100 words
- inconsequential26
- picturesqueness28
- unquestioningly28
- acquisitiveness29
- churrigueresque30
- consequentially29
- equalitarianism26
- grandiloquently29
- inquisitiveness27
- quarrelsomeness26
15 letter words with Z
495 words
- conventionalize29
- rationalization24
- crystallization29
- destabilization27
- detribalization27
- disorganization26
- externalization31
- hospitalization29
- materialization26
- nationalization24
15 letter words with X
200 words
- experimentation26
- experimentalism28
- excommunication30
- exemplification31
- externalisation22
- externalization31
- extracurricular26
- expressionistic26
- extraordinarily26
- oxytetracycline32
15 letter words with J
50 words
- objectification31
- injudiciousness25
- unobjectionable28
- jurisprudential25
- photojournalism29
- photojournalist27
- adjustabilities25
- circumjacencies32
- conjugatenesses25
- conjugationally28
Why fifteen-letter words matter
Words of this length are where the big scores live. Playing all seven tiles from your rack in one turn earns a 50-point bingo bonus in Scrabble, so recognising fifteen-letter patterns from a jumbled rack is worth more than any single high-value tile.
The list above is ranked by how common each word is in written English rather than alphabetically, using corpus frequency data. That means the words most likely to be accepted without an argument, and most likely to be useful, appear first.
Finding fifteen-letter words from your own letters
Browsing a full list is useful for study, but during a game you need the intersection of the list and your rack. Enter your tiles into the finder above and set the length to 15; the results are every fifteen-letter word your letters can actually build, ordered by points. Add a starting or ending letter if you are playing off a tile already on the board.
Other word lengths
2 letter words128 words3 letter words1,311 words4 letter words5,528 words5 letter words12,653 words6 letter words22,418 words7 letter words33,296 words8 letter words40,649 words9 letter words41,231 words10 letter words35,874 words11 letter words28,114 words12 letter words20,454 words13 letter words13,977 words14 letter words9,213 words
Frequently asked questions
How many 15 letter words are there?
This dictionary contains 5,812 fifteen-letter words. That figure includes inflected forms such as plurals and past tenses, which are valid in most word games.
What is the highest-scoring 15 letter word?
Among 15-letter words, OXYPHENBUTAZONE is one of the highest scoring at 41 points in Scrabble. High-value 15-letter words almost always contain Q, Z, X or J.
What are some common 15 letter words?
Some of the most familiar fifteen-letter words are DIFFERENTIATION, EXPERIMENTATION, INDIVIDUALISTIC, INSTRUMENTALITY, INSTRUMENTATION, MISCONSTRUCTION, STRAIGHTFORWARD, CONFIDENTIALITY. The list above is ordered by how common each word is, so the most recognisable ones appear first.
Are all 15 letter words valid in Scrabble?
Most are, but tournament play uses an official regional word list that differs slightly from a general English dictionary. For casual games this list works well; for sanctioned play, check the official dictionary for your region.