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.
coappears cappers coppers copperas capers copers copperahs copiers coppras cuppers coopers capris gapers cooperies capoeiras gawpers kippers quippers copras caprice coprahs keepers koupreys
coappears appears reappears pears suppers sippers coppers wrappers peppers nippers cuppers copperas knappers lappers mappers lippers kippers zippers tappers toppers whappers whoppers choppers shoppers quippers gippers cappers sappers boppers hoppers loppers gyppers moppers nappers pipers spears rappers rippers poppers papers zappers dippers tippers uppers whippers chippers shippers yappers pars
coappear capper copper copperah coppery