Probasco rhymes with:
basco, basco, belasco, blasco, blasko, carrasco, cordasco, falasco, fosco, frasco, glasco, jasko, lasco, manasco, marasco, menasco, moskow, nolasco, osco, pasco, pasko, rackow, rasco, rockow, rosasco, roscoe, stasko, tomasko, vasko, velasco, wasko, waskow, zelasko
Probasco sounds like:
paperback, paperbacks, paperboy's, paperboys, paribas, paribas's, perhaps, perovich, perpich, poorbaugh, porpoise, porpoises, powerbook, powerpc, powerpcs, powerpcs', prapas, prefabs, preface, prefix, prepackage, prepuce, previews, previous, priebke, privacies, privacy, 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