Rater rhymes with:
crater, curator, frater, freighter, grater, greater, prater, praytor, straighter, strater, traitor, wheelabrator
Rater sounds like:
radar, radder, rader, radiator, raeder, raether, raider, rather, ratier, ratterree, rattray, reader, readier, redder, reder, redraw, reeder, rehder, reider, reiter, reitera, reither, reitter, reorder, retire, retiree, retro, retry, retter, reuter, reuther, reutter, ridder, rider, rieder, riederer, rioter, riter, ritter, roder, rodier, roeder, roederer, roether, rohwedder, rohweder, rooter, rotary, rother, rothery, rotor, rotter, router, routhier, rudder, ruder, rueter, ruether, ruiter, ruter, ruther, rutter, ryder, ryther, ryutaro