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.
cuprous cupreous cuppers capers copers capris copras coppras coprahs copiers coopers coppers cappers koupreys copperas quippers guipures capoeiras coappears cooperies copperahs gapers caprice gawpers keepers kippers
cuprous leprous pros uprose sprues saporous repros papyrus leprose prose leprosy pross pours praos praus proas parous porous vapours cupreous prosy prows viperous repours proso cyprus pyros sapours biparous spurious vaporous uprouse