KNOCKS is a playable word

knock Scrabble® Dictionary

verb
knocked, knocking, knocks
to strike sharply
22 Playable Words can be made from "KNOCKS"
   2-Letter Words (5 found)
   3-Letter Words (7 found)
   4-Letter Words (5 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)