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.
goas gas gos goos goes koas gaes gays goys goosy gawsy gassy gauss goose goosey gawsie kos cos kas caws keas cosy coss cays gaze coos guys kays cows koss coys casa kaas kois kaes case gazoo quass gussy quais guise cosie cosey cause gauze gauzy quasi guess quays