CRUMBING is a playable word

crumb Scrabble® Dictionary

verb
crumbed, crumbing, crumbs
to break into crumbs (small pieces)
87 Playable Words can be made from "CRUMBING"
   2-Letter Words (8 found)
   5-Letter Words (12 found)
   6-Letter Words (5 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)