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.
coss cos coos cosy koss cows coys cuss cusso cosie cosey cooees cassia cuisse cooeys kousso kos gos coz kiss goas cues kois cays goes cozy koas goos casa caws case goys gussy kusso cause cozey guess gassy kissy goosy gauss goose cozie quass
boss foss joss coss koss loss moss doss toss os