DUMMKOPFS is a playable word

dummkopf Scrabble® Dictionary

noun
pl. dummkopfs
a dolt
97 Playable Words can be made from "DUMMKOPFS"
   2-Letter Words (15 found)
   5-Letter Words (8 found)
   8-Letter Words (1 found)
   9-Letter Words (1 found)