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.
caird card cared cardia cardio caried crud carried cred cord cart cardiae curd guard garda carat cured credo cored creed carte crowd caret cried curdy crude carate curred cruddy corody garred carrot crowdy quired corrade corrode corrody curried carroty quarried crit curt grad grid kart
caird yaird shaird laird bared garda airt gird heired hired raid reared faired irid heard card arid seared fired soared bard tardy laired hard yard weirdo sheared paired shard waired choired chard lardy wired hared pardi barde wared sard teared neared mired deaired pared quired hairdo sired fared dared roared geared aired eared braid cared lard tared fard bird virid fiord haired guard shared nard hoard ired oared chared hardy farad sarod rared beard pardy tardo board liard feared tired ward weird pard weirdy chaired yird
car care carr carry coir acari cakier scar scare scarey scarry scary