DUMBING is a playable word

dumb Scrabble® Dictionary

adjective
dumber, dumbest
lacking intelligence
verb
dumbed, dumbing, dumbs
to make silent
56 Playable Words can be made from "DUMBING"
   2-Letter Words (9 found)
   4-Letter Words (12 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)