Racehorses rhymes with:
workhorses, concourses, counterforces, workhorses, airforces, bourse's, bourses, concourses, counterforces, course's, discourses, divorces, endorses, enforces, force's, forces, forces', horses', outsources, pierce's, reinforces, resources, resources', source's, workhorses
Racehorses sounds like:
racehorse, 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