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.
cache catch coach cachou cashew catchy gauche gouache cash cutch cooch couch cashaw cashoo gaucho quaich quiche cosh gash
ache mache tache gouache cache poachy peachy nuchae roach match beach quiche nacho macho niche batch coach fitchee dacha reach fiche loach beachy leachy latch hoochie each achy bach boche tach teach touche patch lychee ratch rotche ruche peach rechew nitchie poach miche pacha quaich natch vouchee laich douche sauch rouche leach seiche fitchew mach louche bouchee chew eche gauche catch hatch lichee techie watch