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.
cor core cory coir cooer coria cowry cry kor cru cowrie corrie car cur gor goer kore curr kora cure gore crow gory crew carr care craw carry curia curie curio curry korai curiae currie gooier kouroi