DUMBS is a playable word

dumb Scrabble® Dictionary

adjective
dumber, dumbest
lacking intelligence
verb
dumbed, dumbing, dumbs
to make silent
19 Playable Words can be made from "DUMBS"
   2-Letter Words (3 found)
   3-Letter Words (10 found)
   4-Letter Words (5 found)
   5-Letter Words (1 found)