Aucoin rhymes with:
chicoine, coin, coyne, mccoin, micoin, adjoin, ardoin, beaudoin, boudoin, bourgoin, bowdoin, boyne, broin, burgoyne, chaudoin, chicoine, coin, conjoin, coyne, des_moines, enjoin, goin, goyne, groin, hoyne, jodoin, join, lemoine, leoine, loin, mccoin, mcgloin, micoin, purloin, raboin, rejoin
Aucoin sounds like:
aachen, aasen, accession, accion, acecomm, achaean, acheson, ackman, acme, acne, acumen, acuna, acuson, aegean, aegon, again, agamemnon, agan, agana, agawam, agin, agna, agne, agnew, agony, aickin, aiken, aikin, aikman, ajami, akamine, akana, aken, akin, akiyama, akyanama, aoshima, aquino, asahan, asean, ashame, ashen, ashman, asiain, asian, asimow, asinine, askin, asman, assassin, assign, assume, aswin, ausman, auzenne, awaken, awesome, axiom, axon, axsom, aygen, azcona