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.
clay cullay claw coly cola cloy coala coaly colly cully cooly calla coyly coolly col cull call cool clue coil gley calo caul coal clew cole kola gala glia cowl gluey kelly golly galah gayly gally galea gaily koala gully
lay allay belay flay clay cullay play relay slay delay waylay la