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.
chart charity chariot chard chert chared cherty charade cheroot chaired charred shard chord short shirt shaird shared shirty chored shorty cheered chirred choired choroid churred sheared sheroot shortie choreoid chorioid
chart hart art chert whort hard chard warty tarot part tarty quarto quart airt arty peart shirt boart fart heart quarte shard hearty tart dart party mart kart wart karat carte cart caret carat hurt short
char charro charry chary chare charr chair ochreae cherry ochre chiro sharia chore share chiru churro chirr chirre shariah chorea ochrea churr ochry