15 letters
- tyrannosauruses21
- ultimogenitures24
- ultramicrotomes26
- ultrastructures22
- ultravirilities22
- unboundednesses25
- uncertainnesses22
- uncleanlinesses24
- underactivities25
- underemphasizes35
- undutifulnesses25
- unearthlinesses21
- unfamiliarities24
- unfeelingnesses25
- unguardednesses23
- unhealthinesses23
- universalnesses23
- unknowabilities29
- unnaturalnesses21
- unpunctualities27
- unreliabilities22
- unselfishnesses24
- unseriousnesses19
- unsettlednesses20
- unsightlinesses23
- unsociabilities24
- unsuitabilities22
- unwillingnesses26
- unworkabilities28
- unworldlinesses24
- upgradabilities26
- valuelessnesses23
- venerablenesses25
- venturousnesses23
- veraciousnesses24
- verifiabilities26
- verisimilitudes25
- veritablenesses24
- versatilenesses21
- vexatiousnesses28
- vicariousnesses24
- visionarinesses21
- vivaciousnesses28
- voicelessnesses24
- voluntarinesses23
- voraciousnesses24
- vulnerabilities26
- waterlessnesses20
- wearisomenesses22
- whimsicalnesses28
- wholesomenesses25
- withdrawnnesses26
- woebegonenesses25
- wonderfulnesses26
- worrisomenesses22
- worthlessnesses22