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.
coys cos cooeys coos cays goys coss cows cosy cozy cozey cosey cosie cooees kos gos coz cuss caws cues gays case casa kois kays koas goas goos guys keys koss goes cause cozie cusso goose goosy quays queys
boys buoys foys hoys joys coys goys soys toys os