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.
cocain cocaine cocoon coigne cockney coquina cogon kokanee
cocain cain can chicane takin scan cane coin gain kain again akin eucaine recane recoin regain jacana decane cocaine toucan pecan chicano
coca cock cocky coco cocoa coocoo acock