CAUSTIC is a playable word

caustic Scrabble® Dictionary

noun
pl. caustics
a corrosive substance
51 Playable Words can be made from "CAUSTIC"
   2-Letter Words (10 found)
   3-Letter Words (20 found)
   4-Letter Words (15 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)