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.
goys gos goos goes guys goas coys gays goosy goose goosey cooeys kos cos gas kois coss kays cays gaes cozy cows koss koas cosy coos keys cozey quays gauss gauzy gazoo gawsy guess cosie gussy gassy cosey guise queys
boys buoys foys hoys joys coys goys soys toys os