SCHISTS is a playable word

schist Scrabble® Dictionary

noun
pl. schists
a rock that readily splits into parallel layers
41 Playable Words can be made from "SCHISTS"
   2-Letter Words (6 found)
   3-Letter Words (12 found)
   4-Letter Words (13 found)
   5-Letter Words (6 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)