15-letter words
There are 3,192 fifteen-letter words in our dictionary. The most common are TOMBOYISHNESSES, TONSILLECTOMIES, TOOTHSOMENESSES, TOTALITARIANIZE and TOXICOLOGICALLY.
Long words like these rarely fit in one go, but they are the answers to many jumbles, spelling challenges and word-ladder puzzles. Most are built from a shorter root plus a common prefix or suffix.
15-letter words
- tomboyishnesses25
- tonsillectomies19
- toothsomenesses20
- totalitarianize24
- toxicologically30
- tractablenesses19
- traditionalisms18
- traditionalized26
- traditionalizes25
- transaminations17
- transcendencies20
- transhistorical20
- transilluminate17
- transistorising16
- transistorizing25
- translatability20
- transliterating16
- transmigrations18
- transmissometer19
- transmogrifying25
- transparentized27
- transparentizes26
- transparentness17
- transpirational17
- transpositional17
- transsexualisms24
- transubstantial17
- transvaluations18
- traumatizations26
- treacherousness20
- tremulousnesses17
- triangularities16
- trichomonacidal25
- trichomonacides25
- trifluoperazine29
- trihalomethanes23
- trinitrotoluene15
- trisoctahedrons21
- trivializations27
- troublesomeness19
- troublousnesses17
- trueheartedness19
- trypanosomiases22
- turbogenerators18
- typographically31
- tyrannosauruses18
- ultimogenitures18
- ultracentrifuge21
- ultracommercial23
- ultraconvenient20
- ultrademocratic22
- ultrafastidious19
- ultraliberalism19
- ultramarathoner20
- ultramicroscope23
- ultramicrotomes21
- ultramodernists18
- ultramontanisms19
- ultraprecisions19
- ultrastructures17
- ultravirilities18
- unacceptability26
- unaccommodating25
- unadulteratedly20
- unalterableness17
- unanswerability23
- unanticipatedly23
- unappreciations21
- unassailability20
- unboundednesses19
- uncategorizable29
- uncertainnesses17
- unchangeability26
- unchoreographed27
- unchronological23
- uncircumcisions23
- uncleanlinesses17
- unclimbableness23
- uncompassionate21
- uncomplainingly25
- uncomplimentary26
- uncompromisable25
- unconcernedness20
- uncopyrightable28
- undemonstrative21
- underactivities21
- underemphasized33
- underemphasizes32
- underhandedness21
- underinflations19
- undernutritions16
- underproduction21
- underpublicized32
- understandingly21
- understatements18
- undervaluations19
- undesirableness18
- undutifulnesses19
- unearthlinesses18
- unemployability27
- unendurableness18
- unexceptionable28
- unexceptionably31
- unextraordinary26
- unfamiliarities20
- unfavorableness23
- unfeelingnesses19
- unforgivingness23
- unfossiliferous21
- unguardednesses18
- unhealthinesses21
- uniformitarians20
- unimaginatively24
- uninformatively26
- uninhibitedness21
- unintelligently19
- universalnesses18
- unknowabilities24
- unknowledgeable26
- unmelodiousness18
- unmitigatedness19
- unnaturalnesses15
- unobtrusiveness20
- unpretentiously20
- unprofessionals20
- unpunctualities19
- unreliabilities17
- unrevolutionary21
- unselfishnesses21
- unseriousnesses15
- unsettlednesses16
- unsightlinesses19
- unsociabilities19
- unsubstantially20
- unsuitabilities17
- unsymmetrically27
- untraditionally19
- unwillingnesses19
- unworkabilities24
- unworldlinesses19
- upgradabilities21
- utilitarianisms17
- valetudinarians19
- valuelessnesses18
- vasodilatations19
- venerablenesses20
- ventriloquially30
- ventriloquistic29
- ventriloquizing37
- venturesomeness20
- venturousnesses18
- veraciousnesses20
- verifiabilities23
- verisimilitudes21
- veritablenesses20
- versatilenesses18
- vexatiousnesses25
- vicariousnesses20
- vicissitudinous21
- viscoelasticity25
- visionarinesses18
- vivaciousnesses23
- vivisectionists23
- voicelessnesses20
- volatilizations27
- voluntarinesses18
- voraciousnesses20
- voyeuristically26
- wappenschawings31
- warmheartedness24
- warrantableness20
- waterlessnesses18
- wearisomenesses20
- weatherboarding25
- weatherizations30
- weatherproofing27
- weltanschauungs24
- westernisations18
- westernizations27
- whatchamacallit30
- whimsicalnesses25
- whistleblowings27
- wholesomenesses23
- withdrawnnesses25
- woebegonenesses21
- wonderfulnesses22
- worrisomenesses20
- worthlessnesses21
- wrongheadedness24
- xerographically33
- xeroradiography32
- zoogeographical33
Other word lengths
15-letter words starting with
15-letter words ending in
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Word lists & patterns
- Words Starting With Words that begin with any letters you choose.
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- Words by Length Lists of 2- to 15-letter words.
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Puzzle & game solvers
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- Boggle & Word Search Solver Find every word hidden in a letter grid.
- Strands Helper Trace valid words through a Strands-style grid.
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Word reference & utilities
- Word Checker Check whether a word is valid in word games.
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- Palindrome Finder Words that read the same forwards and backwards.