CUMBER is a playable word

cumber Scrabble® Dictionary

verb
cumbered, cumbering, cumbers
to hinder
36 Playable Words can be made from "CUMBER"
   2-Letter Words (7 found)
   3-Letter Words (16 found)
   4-Letter Words (8 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)