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.
kafir kaffir kefir caviar gaffer caviare gauffer goofier quaffer
kafir fir afar vair fire fiar fairy kefir puffier loafer refire safer daffier defier wafer chaffier affair afire fair miffier buffier huffier iffier goofier kaffir affaire leafier beefier reefier reifier zaffir deafer deifier chafer chuffier