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.
guys gays goys gussy gauss queys gauzy guise guess quays gussie gos gas goos keys goes gaes cuss cues goas kues coys cays kays cause cusso gassy goose goosy kusso quais quasi quass gauze gawsy