Protean rhymes with:
teahan, teehan, achaean, aegean, asean, 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, rijn, shahian, sheahan, sheehan, sofian, teahan, teehan, tennessean, theon, treon, vannguyen, vian
Protean sounds like:
paradyne, parden, pardini, pardon, part-time, partain, parten, parthenia, parthenon, parthian, partin, partition, partney, parton, parttime, partum, pepperdine, perdomo, perrodin, pertain, pertamina, portadown, portion, portman, portney, portnoy, predation, predawn, preordain, preteen, prettyman, proration, protein, protium, proton, pruden, prudhomme, purdham, purdin, purdom, purdon, purdum, puritan