DUMBSIZE is a playable word

dumbsize Scrabble® Dictionary

verb
dumbsized, dumbsizing, dumbsizes
to reduce the workforce so low that work cannot be done effectively
107 Playable Words can be made from "DUMBSIZE"
   2-Letter Words (14 found)
   6-Letter Words (6 found)
   8-Letter Words (1 found)