Estrus rhymes with:
estrous, ambidextrous, dextrous, disastrous, estrous, headmistress, lustrous, mistress, monstrous, actress, ambidextrous, beatrice, buttress, citrus, dextrous, disastrous, estrous, fortress, headmistress, idolatrous, kontras, lustrous, mattress, mistress, monstrous, nitrous, peatross, petrus, sentras, waitress, watrous
Estrus sounds like:
ecuador's, equators, esoteric, esters, estrich, estrous, estuaries, eszterhas, executors, exteriors, extras