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.
denim dunam dynamo
denim nim onium venom paynim muonium anime animi biennium phenom anima minium ionium genom conium gonium hymenium minim minima hahnium
deni den danio dean deign dene deny diene duenna tenia teniae detinue