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.
quays queys quasi quais quass queasy queazy cays guys kays quassia gays queues kas gas qis caws coys cuss kues cues kaes kaas gaes goas casa keas case keys goys koas quiz
quays ays shays ways says pays mays lays bays buoys buys fays hays jays cays gays guys kays quais quasi quass queys luaus nays rays days chays yays
quay qua quai quey aqua aquae quack quacky quag quagga quaggy quake quaky squaw