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.
cos coos coys coss cosy cows cosey cosie cooeys kos coz gos cooees caws kois cays koss goys goes case cues casa cozy goos cuss goas koas goosy goose cause cusso cozie cozey cassia causey cuisse goosey kousso