11 letters
- transposons16
- trichinoses17
- trichinosis17
- tropomyosin20
- troposphere19
- trypanosome20
- turboshafts20
- typhlosoles20
- tyrannosaur16
- tyrosinases14
- uncrossable20
- underbosses17
- underexpose24
- undiagnosed18
- undisclosed19
- unloosening18
- urediospore16
- uredospores16
- vasospastic21
- verboseness19
- verbosities18
- villosities17
- viscosities18
- westernmost18
- whosesoever20
- zeptosecond28