SLACKS is a playable word

slack Scrabble® Dictionary

adjective
slacker, slackest
not tight or taut
verb
slacked, slacking, slacks
to slacken
31 Playable Words can be made from "SLACKS"
   2-Letter Words (4 found)
   3-Letter Words (10 found)
   4-Letter Words (10 found)
   5-Letter Words (6 found)
   6-Letter Words (1 found)