Racehorse rhymes with:
clotheshorse, deadhorse, whitehorse, workhorse, agresource, clotheshorse, concourse, counterforce, deadhorse, healthsource, intercourse, taskforce, telsource, uniforce, unisource, whitehorse, wilberforce, workforce, workhorse
Racehorse sounds like:
racehorses, racers, rackers, raisers, rakers, raucher's, razor's, razors, reassures, recharge, recourse, recross, regress, requires, rescuers, reseachers, research, research's, researches, resource, resources, resources', richcreek, rickers, riechers, rigorous, rigors, riker's, rikers, rockers, rockrose, roger's, rogers, rogers', rogers's, rosaria's, rosaries