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.
gays gas goys cays kays goas guys gaes gauss gawsy quays gauzy gassy gawsie kas gos goos caws koas case casa coys kaas keys goes keas kaes gaze goosy cause quass gauze gazoo goose guess guise quais quasi gussy queys
ays bays shays ways says rays pays nays mays lays quays kays gays cays jays hays fays days chays yays as