CLASTS is a playable word

clast Scrabble® Dictionary

noun
pl. clasts
a fragment of rock
42 Playable Words can be made from "CLASTS"
   2-Letter Words (5 found)
   3-Letter Words (13 found)
   4-Letter Words (15 found)
   5-Letter Words (8 found)
   6-Letter Words (1 found)