MUTTERED is a playable word

mutter Scrabble® Dictionary

verb
muttered, muttering, mutters
to speak unclearly
88 Playable Words can be made from "MUTTERED"
   2-Letter Words (11 found)
   3-Letter Words (24 found)
   6-Letter Words (6 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)