KNUCKLES is a playable word

knuckle Scrabble® Dictionary

verb
knuckled, knuckling, knuckles
to hit with the knuckles (the joints of the fingers)
79 Playable Words can be made from "KNUCKLES"
   2-Letter Words (7 found)
   3-Letter Words (21 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)