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.
crutches crotches cratches crouches grutches creches crushes curches carritches caroches grouches caroaches carroches crashes creeshes currachs qurushes gurshes qurshes
ratches carritches rotches cratches britches retches wretches crutches crotches grutches parritches reaches marchese curches grouches arches rouches huaraches brooches perches reechoes soroches marches barouches ruches larches merches braches creches tracheas earaches troches preaches torches carroches oraches searches marchesa brioches birches caroches rechews parchesi parches porches caroaches diarchies lurches riches crouches broaches marchesi breaches breeches trochees roaches churches
crutch cratch crotch crouch grutch