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.
parritches parches parchesi parishes parcheesi perches porches parchisi perishes preaches prechose purchase parashahs prechoose prochoice preshows
carritches britches parritches ratches retches riches rotches wretches birches brioches cratches crotches crutches grutches