NUMSKULL is a playable word

numskull Scrabble® Dictionary

noun
pl. numskulls
a dunce
36 Playable Words can be made from "NUMSKULL"
   2-Letter Words (5 found)
   3-Letter Words (11 found)
   4-Letter Words (13 found)
   5-Letter Words (6 found)
   8-Letter Words (1 found)