COMBUST is a playable word

combust Scrabble® Dictionary

verb
combusted, combusting, combusts
to burn
82 Playable Words can be made from "COMBUST"
   2-Letter Words (10 found)
   3-Letter Words (31 found)
   5-Letter Words (6 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)