Porpoises rhymes with:
campuses, encompasses, purposes, accomplices, alice's, alices, amaryllises, amenaces, apparatuses, businesses, buttresses, campuses, circuses, citrus's, davis's, encompasses, furnaces, harnesses, headmistresses, horace's, hostesses, justices, mattresses, maurice's, mistresses, notices, offices, omnibuses, orifices, palace's, palaces, practices, premises, promises, purchases, purposes, seamstresses, services, sinuses, surfaces, tauruses, terraces, texas's, tortoises, treatises, tsongas's, viruses, wallace's, weaknesses, witnesses
Porpoises sounds like:
paperback, paperbacks, paperboy's, paperboys, paribas, paribas's, perhaps, perovich, perpich, poorbaugh, porpoise, powerbook, powerpc, powerpcs, powerpcs', prapas, prefabs, preface, prefix, prepackage, prepuce, previews, previous, priebke, privacies, privacy, probasco, probe's, probes, proboscis, probus, profess, professes, profs, profuse, proofs, propes, prophecies, prophecy, prophesies, propose, proposes, propps, props, proves, provigo, provigo's, proviso, provisos, provoke, provokes, provus, purpose, purposes, purves, purveys, purvis