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.
caprice capris cooperies capers cappers cupreous capoeiras coappears copers gapers copras coopers copiers coppers coppras coprahs cuppers cuprous gawpers
caprice price reprice pricey pricy pries prise prize apprise apprize reprise spruce uprise