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.
swan sewan swain seawan swanny swine swoon swoun sweeny swoony sweeney swinney
hwan wan jawan gowan rewan rowan seawan sewan swan deewan dewan diwan