Os rhymes with:
aase, abbas, alsace, blas, bos, boss, bosse, clos, crosse, daas, dazs, demoss, devoss, floss, foss, fosse, gosse, grosse, haas, haase, haass, hahs, hamas, hamas', hammas, hammas', hasse, hoss, kjos, klaas, klos, kos, lacoss, lafosse, las, maass, mohs, pos, ross, ross', rosse, semigloss, tomas, vanoss, vohs, vos, vyas
Os sounds like:
o'hashi, o'kicki, o's, o'shea, o.'s, o.s, o.s', oak, oak's, oakes, oakey, oaks, oaks', oaky, oas, oases, oasis, oaxaca, ocasio, ocaw, ocaw's, occhoa, occhoa's, och, ochoa, ochs, oesch, og, ogawa, ogg, oh's, ohashi, ohio's, ohs, oishi, oj, oja, oji, ok, oka, okasaki, okay, okays, okaz, okazaki, okey, oki, okie, okwu, oohs, ooohs, ooze, oozes, osage, osages, osaka, osake, osaki, osakowa, osakowa's, osco, ose, osh, osha, osha's, oshawa, oshea, oshkosh, osiecki, osika, osowski, oss, ossa, osso, osuch, oswego, ouaga, ouch, owes, owosso, ox, oxoco, oxy, oz, ozaki, ozawa, ozga, ozick, ozick's, ozzie