FROWSTIEST is a playable word

frowsty Scrabble® Dictionary

adjective
frowstier, frowstiest
musty
416 Playable Words can be made from "FROWSTIEST"
   2-Letter Words (23 found)
   8-Letter Words (6 found)
   9-Letter Words (2 found)
   10-Letter Words (1 found)