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.
gor gore gory goer gooier kor gar cor kore kora guru grue guar gree gaur grey core coir gray grew grow cory cooer coria cowry guiro gurry korai corrie cowrie kouroi