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.
passim possum
passim sim sima hassium caesium lissom misaim possum cesium
passe passee pass pas pias spas pease pussy peas posse piss pase pays paseo paise paisa puss paws paps pause upas