CRUMBLING is a playable word

crumble Scrabble® Dictionary

verb
crumbled, crumbling, crumbles
to break into small pieces
133 Playable Words can be made from "CRUMBLING"
   2-Letter Words (9 found)
   7-Letter Words (5 found)
   8-Letter Words (2 found)
   9-Letter Words (1 found)