Oka rhymes with:
aloka, arocha, boca, carioca, ciocca, coca, cocca, darocha, fujioka, fukuoka, iacocca, kataoka, larocca, loca, matsuoka, moca, mocha, moka, morioka, muraoka, nishioka, roca, rocha, roka, savoca, seroka, shizuoka, soroka, sroka, yoshioka
Oka 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, okasaki, okay, okays, okaz, okazaki, okey, oki, okie, okwu, oohs, ooohs, ooze, oozes, os, 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