CRUMB is a playable word

crumb Scrabble® Dictionary

verb
crumbed, crumbing, crumbs
to break into crumbs (small pieces)
13 Playable Words can be made from "CRUMB"
   2-Letter Words (2 found)
   3-Letter Words (9 found)
   4-Letter Words (1 found)
   5-Letter Words (1 found)