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.
goer gor gooier gore gory cooer kor gar cor core grue gree coir guru gaur grew grey grow keir cory kier guar kora gray kore coria cowry guiro gurry kerry korai queer query
hoer cooer goer doer wooer shoer er or