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.
cows cos caws coos coss cosy coys cosie cosey cooees cooeys kos coz gos casa goes cuss case cays koas cues goys cozy goos kois goas koss cause cozey cozie cusso gawsy goose goosy
bows mows shows wows dows rows powwows pows nows knows miaows bowwows meows lows cows jows hows vows sows tows chows yows os