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.
copperahs copperas coppers coppras coprahs copers copras coappears copiers coopers cappers cuppers capers capoeiras cooperies kippers quippers capris gapers gawpers keepers koupreys
copperahs copperas coprahs operas
copper copperah coppery coper capper coappear cooper coopery copier coppra cupper