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.
coprahs copras copperahs coppras copperas copers coppers copiers coopers coappears cooperies capoeiras capers capris cappers cuppers cuprous cupreous koupreys gapers caprice gawpers keepers kippers
coprahs paras pariahs praos prase praus prays proas copperahs copperas coppras copras operas sprays whiprays