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.
gallon galloon galleon gallein gluon galena callan cullion glen clon clown colon clone glean colone coloni colony kalian kaolin cauline colleen guyline kaoline
billon ballon bouillon gallon talon pollen solon nylon reloan melon pillion lown mullen violone gluon lion loan saloon chalone colon aloin loon cullion felon lone loin eloin flown hellion callan clone zillion colone bullion solion pelon sullen million salon galloon pleon colony mullion jillion lallan galleon blown woollen pylon talion coloni balloon fallen clown alone clon halon billion phylon belon felony shalloon
galley gally gall gal gaol gully galeae gull galea goalie gale gayly calla galah callee call goal gala golly gaily gulley callow egal