MULLOCK is a playable word

mullock Scrabble® Dictionary

noun
pl. mullocks
waste earth or rock from a mine
(adjective) mullocky
21 Playable Words can be made from "MULLOCK"
   2-Letter Words (6 found)
   3-Letter Words (5 found)
   4-Letter Words (8 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)