13 letters
- secessionists17
- selenocentric22
- semiporcelain24
- significances26
- sincerenesses18
- stercoraceous20
- straightlaced22
- straitlacedly21
- streptomycete24
- subadolescent23
- subcoriaceous24
- subserviences25
- substanceless22
- supereminence25
- surveillances24
- telencephalic27
- telencephalon25
- tercentennial20
- thenceforward26
- theocentrisms22
- thoroughbrace26
- transcendence23
- transcendency25
- transferences21
- transhumances24
- translucences23
- translucently23
- transmittance21
- transparences21
- triceratopses19
- trichothecene24
- triglycerides22
- ultradistance20
- ultraviolence24
- unceremonious23
- uncertainness20
- uncertainties19
- unconceivable30
- unconcernedly27
- underfinanced25
- undersurfaces23
- unenforceable26
- unexceptional30
- unimportances25
- unnecessarily22
- unprecedented24
- unreminiscent23
- unserviceable26
- unsusceptible26
- valpolicellas27
- vicegerencies26
- viceroyalties23
- violoncellist24
- voicelessness22