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.
cooperies coopers copers copiers coppers copperas copperahs copras coappears capers capris cappers cuppers caprice coprahs coppras capoeiras gapers gawpers keepers kippers guipures koupreys quippers
aperies fopperies japeries cooperies moperies naperies poperies roperies duperies peres peris pries paries peeries perries pauperize
cooper coopery coper copier copper copperah coppery scooper