Rancor rhymes with:
ranker, anchor, anker, banker, betancur, canker, danker, hanker, manker, ranker, sanker, shanker, tanker
Rancor sounds like:
rainger, rainmaker, ramaker, ramser, ramseur, ramseyer, rancher, ranchera, ranchero, ranger, ranker, ransier, reininger, reinsure, reinsurer, rencher, renegar, renninger, ringer, rininger, rinker, rominger