FISTS is a playable word

fist Scrabble® Dictionary

verb
fisted, fisting, fists
to strike with the fist (the hand closed tightly)
17 Playable Words can be made from "FISTS"
   2-Letter Words (5 found)
   3-Letter Words (6 found)
   4-Letter Words (4 found)
   5-Letter Words (2 found)