Asean rhymes with:
achaean, aegean, boolean, breon, cyclopean, eon, epicurean, eritrean, european, feehan, fujian, galilean, heon, ian, indo-european, jacobean, jian, keehan, korean, maccabean, mcgeean, mckeon, mckeone, meehan, mycenaean, paean, peon, plebeian, protean, rijn, shahian, sheahan, sheehan, sofian, teahan, teehan, tennessean, theon, treon, vannguyen, vian
Asean 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, ashame, ashen, ashman, asiain, asian, asimow, asinine, askin, asman, assassin, assign, assume, aswin, aucoin, ausman, auzenne, awaken, awesome, axiom, axon, axsom, aygen, azcona