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.
drowsily dressily drizzly doorsill dorsally hydrosol dorsal dorsel drizzle tersely trysail hydrocele tarsal
drowsily rosily brassily frowzily horsily crusily grassily greasily prissily prosily pursily dressily
drowse drowsy draws dross drossy duros trows