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.
coach cache catch cooch couch cachou catchy cosh cash gouache cutch cashaw cashew gauche gaucho gotcha quaich gash gosh
coach roach loach poach pouch dacha reach catch laich poachy batch achy hooch hootch hotch rotch touch tache cache vouch gouache macho mocha mouch natch ouch patch peachy hatch mach ache each notch sauch bach nacho match couch quaich beachy latch leach boche teach cooch tach mooch loch pacha peach leachy beach botch pooch ratch mache watch
caca cacao caeca coca cock cocky coco cocoa coocoo chock