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.
sauch such sash sushi sashay seiche
sauch butch mach macho loach patch ouch peachy laich leach gauche pouchy poachy reach achy gouache batch rouche beachy sheuch vouch couch dacha beach duchy bach mucho tach teach mouch touch nacho touchy nautch ache shaugh latch gaucho catch ratch poach pouch cutch quaich roach peach nucha pacha leachy mache louche hutch hatch each dutch natch touche mutch teuch match tache much watch cache douche heuch such coach ruche yuch