KNOCKOUT is a playable word

knockout Scrabble® Dictionary

noun
pl. knockouts
a blow that induces unconsciousness
43 Playable Words can be made from "KNOCKOUT"
   2-Letter Words (7 found)
   3-Letter Words (13 found)
   4-Letter Words (18 found)
   5-Letter Words (4 found)
   8-Letter Words (1 found)