Kos rhymes with:
lacoss, 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, lacoss, lafosse, las, maass, mohs, os, pos, ross, ross', rosse, semigloss, tomas, vanoss, vohs, vos, vyas
Kos sounds like:
k, k's, k., k.'s, ka, kaas, kach, kachuck, kagawa, kage, kagey, kagy, kah, kai, kaisha, kaji, kakos, kakuei, kao, kasagic, kasch, kaschak, kase, kasese, kasey, kash, kasha, kashiwagi, kashoggi, kasi, kasich, kasich's, kasick, kasik, kaska, kaske, kass, kassa, kassis, kasza, kau, kauai, kauk, kaus, kausch, kawa, kawaguchi, kawai, kawasaki, kawecki, kaweske, kay, kay's, kaya, kayak, kayaks, kaye, kayes, kayo, kays, kazakh, kazakhs, kazee, kazis, kazoo, kazuhiko, kazuo, kea, keach, keagy, keahey, keas, keay, keck, kee, kee's, keech, kees, keese, keesee, keesey, keg, kegg, kegs, kehoe, keiichi, keiji, keiko, keio, keisei, keisuke, keizai, keo, keogh, keokuk, keough, keske, kess, keswick, kew, key, key's, keye, keyes, keyes', keys, keziah, khaki, khakis, khashoggi, khe, khoo, khuu, ki, kia, kiawah, kick, kicks, kies, kiesow, kiess, kiichi, kijowski, kika, kiki, kikuchi, kiosk, kiosks, kious, kis, kisch, kisco, kise, kish, kisha, kishi, kiska, kiska's, kiss, kissack, kissee, kisses, kissick, kiszczak, kiwi, kiwi's, kiwis, kiyoshi, kizziah, kjos, kkk, ko, kocak, koch, kochis, koci, kocis, kock, kocsis, koeki, koga, kogi, kogyo, koh, koichi, koike, kojak, koji, kok, koke, kokes, kokesh, koki, koko, koko's, kokoschka, kokoszka, kokusai, koo, kooi, kook, kooks, kooky, koos, kooy, kosa, kosak, kosakowski, kosch, koscheck, koscheck's, kosco, kosek, kosh, kosik, koska, koskey, koski, kosko, kosky, kosowski, kosowsky, koss, kossow, kosy, kough, koyo, koza, kozak, kozakiewicz, kozicki, kozik, kozikowski, kozo, kozuch, ksiazek, ku, kuc, kucewicz, kuch, kuck, kuczek, kueck, kujawa, kujawski, kuk, kukje, kukowski, kukuk, kuo, kuow, kus, kusa, kusch, kuse, kusek, kush, kusiak, kuske, kuss, kuze, kwai, kwak, kweisi, kwh, kwik, kwok, kyes, kyi, kyo, kyoko, kyoshi, kyowa, kyu, kyushu