Portion rhymes with:
apportion, proportion, abortion, antiabortion, apportion, contortion, distortion, extortion, forshan, proportion, torsion
Portion 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, portman, portney, portnoy, predation, predawn, preordain, preteen, prettyman, proration, protean, protein, protium, proton, pruden, prudhomme, purdham, purdin, purdom, purdon, purdum, puritan