16 letters
- triboelectricity28
- tumorigenicities26
- tyrannicalnesses25
- ultramicroscopes30
- ultramicroscopic33
- ultramicrotomies27
- ultraparadoxical33
- ultrasonographic29
- unapologetically31
- uncharacteristic29
- undemocratically32
- undiplomatically33
- ungrammaticality32
- unpredictability31
- unscientifically32
- unsophistication27
- unsystematically30
- vasoconstriction28
- vasoconstrictive31
- vasoconstrictors27
- victoriousnesses25
- vindictivenesses30