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.
carritches carroches caroches cratches crotches crutches caroaches curches creches currachs grutches crouches crashes crushes creeshes grouches gurshes qurshes qurushes
carritches britches parritches ratches retches riches rotches wretches birches brioches cratches crotches crutches grutches