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.
merrily merely merl marly merle morally marl moral morel mural morula morelle morello
merrily sorrily furrily cheerily wirily warily riley roily airily aerily eerily fierily frilly leerily drily tearily verily wearily hoarily charily gorily shrilly