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.
koas kas kos kaas kois koss keas kaes goas kays kousso gas gos kis cos kues gaes coss goos cows case keys caws cosy goes cays coys coos casa gays goys kiss cosey quass goose quais cosie gawsy kusso gassy goosy kissy cause gauss quasi kazoo quays