SKULKS is a playable word

skulk Scrabble® Dictionary

verb
skulked, skulking, skulks
to move about stealthily
8 Playable Words can be made from "SKULKS"
   2-Letter Words (1 found)
   3-Letter Words (2 found)
   4-Letter Words (2 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)