13 letters
- supervirtuoso22
- sylvicultures26
- taciturnities18
- tempestuously24
- thaumaturgies22
- thaumaturgist22
- transcultural21
- tubocurarines22
- tumorigeneses20
- tumorigenesis20
- tunablenesses20
- tunefulnesses21
- turbellarians20
- turbidimeters21
- turbidimetric24
- turbochargers24
- turboelectric24
- unadventurous23
- understudying23
- unfortunately23
- unnaturalness19
- unpicturesque32
- unpunctuality27
- venipunctures27
- venturesomely25
- venturousness21
- viticulturist23
- vituperations22