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.
seaweed sawed sewed sowed swede sweet sweetie sweat sweaty
seaweed weed awed shawed weeweed tweed dawed sawed pawed gnawed miaowed mayweed mawed lawed cawed jawed hawed weedy tawed tweedy chawed yawed wed