MUMBLE is a playable word

mumble Scrabble® Dictionary

verb
mumbled, mumbling, mumbles
to speak unclearly
23 Playable Words can be made from "MUMBLE"
   2-Letter Words (7 found)
   3-Letter Words (10 found)
   4-Letter Words (3 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)