STOOLS is a playable word

stool Scrabble® Dictionary

verb
stooled, stooling, stools
to defecate
35 Playable Words can be made from "STOOLS"
   2-Letter Words (4 found)
   3-Letter Words (7 found)
   4-Letter Words (14 found)
   5-Letter Words (8 found)
   6-Letter Words (2 found)