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.
ad add ado aid aide adieu audio at
ad goad chad wad tad dead sad read pad knead mead mad load lead lad quad gad bad cad head had fad bead naiad rad road dad duad toad woad shad