10 letters
- prelogical20
- prothallia17
- ratcheting18
- reallocate15
- recitalist14
- recitation14
- recitativo17
- reclaiming20
- reclothing19
- relational13
- relocating17
- rematching21
- rheostatic15
- rhetorical16
- rigamarole16
- scleromata17
- sclerotial15
- stalagmite16
- sterigmata15
- tablecloth20
- tachometer18
- tailcoated15
- tailgaters13
- taillights16
- tamarillos15
- tautomeric17
- termitaria13
- tetragonal14
- theatrical16
- theistical16
- theocratic18
- thermionic19
- thetically19
- theurgical19
- thimblerig21
- thimerosal16
- thiouracil17
- tholeiitic16
- thorianite13
- timocratic19
- tinctorial15
- tolerating14
- torchlight20
- tortellini13
- tracheitis15
- tracheolar16
- tractional15
- tragically19
- tragicomic21
- tramelling18
- tremolitic17
- trichromat18
- trifoliate14
- trigeminal17
- trilateral12
- triliteral12
- trillionth15
- tripletail15
- triplicate17
- triticales14
- ultralight17
- vacillator19
- vorticella19