Knockout rhymes with:
lockout, blackout, bookout, breakout, checkout, cookout, lockout, lookout, shakeout, stakeout, strikeout, takeout, walkout, workout
Knockout sounds like:
kansas-city, keenest, kenesset, kennecott, kienast, kincade, kincaid, kinkade, kinkead, kinoshita, kinst, kjenstad, knackstedt, knecht, knesset, knight, knighted, knighthood, knocked, knost, knust, kumquat, kunst