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.
keratose krauts korats kraits karats karates keiretsu karts carats greats groats kurtas gratis crates grates creates carates curates curtsey quartos grottos queridas grottoes carts grads crits grots grits grades crowds credos courts curets curtsy gradus carets griots greets cruets quarts grouts quirts
keratose ratos virtuose quartos proteose tortoise treatise
karat karate korat krait kraut