STULLS is a playable word

stull Scrabble® Dictionary

noun
pl. stulls
a supporting timber in a mine
8 Playable Words can be made from "STULLS"
   2-Letter Words (2 found)
   3-Letter Words (2 found)
   4-Letter Words (1 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)