2 syllables:
ca-ca, cacau, cacca, cacky, caco-, caeca, cakey, calker, cao cao, cauca, cauchy, cauker, caulker, cawker, cawky, chi chi, coaker, coca, cocao, cocca, cocchi, cocco, cocher, cocker, cockey, cockeye, cockie, cocky, cock eye, coco, cocoa, cocor, coker, cokie, cooccur, cooh cooh, cookee, cooker, cookey, cookie, cooky, cook a, coo coo, coquet, cou-cou, coucou, cou cou, cow cow, co ca, co co, cucchi, cucco, cuckoo, cuckow, cuco, cukor, kaachi, kaikai, kaikeyi, kaiko, kaucher, kaw kaw, kayko, kayky, kay kay, kecky, keeker, keicher, keiko, kercher, kerker, key key, khakee, khaki, khidki, khoikhoi, kho kho, kicker, kicky, kiecker, kiekie, kika, kiker, kiki, kikka, kikker, kikoi, kircher, kirker, kirkey, ki ki, ko-ko, kochi, kocka, kocur, koeki, koker, koki, kokka, kokko, koko, kolker, kookai, kooker, kookie, kookoo, kooky, koo koo, ko ko, kuchar, kucher, kuecker, kueker, kukai, kukka, kukko, kurka, kyker