Quack rhymes with:
kwak, kwak, wack, whack, aback, ack, adak, akc, attack, back, backe, bak, bakke, beaulac, black, brac, brack, brakke, braque, cac, caq, chirac, clack, crack, dac, dack, dak, dulac, fac, flack, flak, hack, hacke, haq, haque, jac, jack, knack, knick-knack, krack, kracke, kwak, lac, lack, lak, mac, mack, macke, mak, nack, nacke, pac, pack, pak, paque, plack, placke, plaque, post-attack, ptak, rack, rak, repack, sac, sack, sak, schack, schlack, schnack, schrack, shack, shaq, slack, smack, snack, spack, spak, stac, stack, strack, stracke, tac, tack, tacke, tak, trac, track, trak, unpack, vanvlack, wack, whack, wrack, yack, yak, zach, zack, zak
Quack sounds like:
q, q's, q., q.'s, q.s, qawi, qi, qiao, qu, qua, quach, quacks, quai, quake, quake's, quakes, quash, quasi, quassia, quay, quaye, que, queasy, queau, quechee, quek, ques, queue, queues, qui, quiche, quick, quickie, quigg, quik, quiz, quizzes, quo