I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
merles merls morales marls morelles morals morels murals morulas morellos
arles birles parles farles merles orles carles careless carioles heirless carrioles carless relies ferlies grilles varioles hurleys earless borals rallies curlews rouilles ferrules juryless curls carols crewless pearls parrels carrels fireless orioles berryless roles aureoles gorals nerols hourlies fearless morels marls treeless ceorls sorels zorilles darioles doorless proles trailless tireless trollies weariless whirls wireless charlies shorls churls chorales oarless pyrroles arils morals rules quarrels barleys gnarls ferrels corals parols browless furls parolees merls airless coreless goorals ireless cureless byrls creoles rales braless earls burls murals beryls riles parrals barrels herls brollies hurls laurels girolles harls rayless barless ferules nurls areoles farls jurels girlies aryls virls jarls ferals birls furless reales peerless brailles arrowless rilles orals burleys hurlies hairless corrals girls morelles paroles gearless knurls parleys carls morales purls cheerless trawleys tirls pyrrols saurels sorrels zorils dirls perils tearless chorals trolleys warless whirlies whorls charleys shoreless yearlies
merl merle marl marly merely merrily