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.
crushes crashes crutches qurushes crouches creeshes gurshes qurshes curches creches crotches grutches caroches cratches caroaches carroches carritches grouches
rushes qurushes crushes brushes creeshes trashes crashes parishes girshes marshes gurshes rushees brashes crouches grouches ruches rashes qurshes rouches freshes marishes barouches nourishes reshoes perishes reshes cherishes