Postage rhymes with:
cottage, heritage, hermitage, mintage, outage, parentage, percentage, portage, shortage, vantage, voltage, wattage
Postage sounds like:
packets, packwood's, pact's, pacts, pagoda's, pagodas, pas-de-deux, pastas, pastes, pastiche, pastiches, pasts, pectic, pesetas, pestka, pests, phagocytes, physicists, piaget's, pickets, pickett's, picts, pistachio, pistachios, pockets, posits, post's, post-attack, postdates, posts, psychotic, pussycats