Keiner rhymes with:
keehner, keener, kiener, brener, cleaner, deaner, deener, demeanor, diener, fleener, fleenor, flener, greener, intervenor, jeaner, keehner, keener, kiener, leaner, liener, magaziner, meaner, meanor, misdemeanor, orangina, pasadena, queener, rabiner, screener, seanor, treanor, wiener
Keiner sounds like:
kachmar, kainer, kakumaru, kamenar, kamer, kamerer, kaminer, kamir, kammer, kammerer, kammeyer, kamra, kanemaru, kaner, kanner, kashmir, kashmiri, kashner, kasmer, kasmira, kasner, kassner, kawamura, kazmer, kazunori, keehner, keener, kemerer, kemery, kemmer, kemmerer, kemner, keneer, kenmare, kenmore, kennamer, kennemer, kennemore, kenner, kenoyer, kesner, kessner, khmer, kiener, kikumura, kimery, kimmer, kimrey, kimura, kiner, kiniry, kinnear, kinner, kisamore, kisner, kissner, knarr, knauer, kneer, knerr, knorr, knower, kohner, komar, komara, komer, kommer, komori, komura, konner, kuehner, kuhner, kumar, kummer, kumouri, kushner, kushnir, kuzniar