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.
cod coed coda code coude cooed codeia cooeed god cad cot cud coot coat good goad cade cued caid cote quod cadi gowd coati goody cuddy caddy cotta caddie coatee cootie coteau cottae cuddie goodie koodoo