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.
gaes gas goas goes gaze kaes gays guess gauss gassy gauze gawsy gawsie kas gos keys casa keas case kues goys guys caws koas kaas kays cays goos cues gauzy quays guise quasi gussy cause goosy quais gazoo quass goose queys
haes gaes kaes maes waes as es