CRUMBUM is a playable word

crumbum Scrabble® Dictionary

noun
pl. crumbums
a despicable person
18 Playable Words can be made from "CRUMBUM"
   2-Letter Words (3 found)
   3-Letter Words (11 found)
   4-Letter Words (2 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)