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