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.
crashes crushes cratches creeshes caroaches creches qurshes curches gurshes crouches caroches crotches crutches qurushes carroches carritches currachs grouches grutches
brashes crashes rashes trashes girshes marshes qurushes gurshes oraches huaraches freshes earaches brushes broaches braches rushes creeshes crushes breaches roaches qurshes reshoes marishes reshes nourishes reaches parishes caroaches preaches rushees perishes cherishes