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.
cupreous cuprous cuppers koupreys guipures cooperies capris copers copras capers copiers coprahs coppers caprice coppras coopers cappers copperas quippers capoeiras coappears copperahs gapers
cupreous pareos pareus parous porous biparous vaporous viperous cuprous leprous saporous spurious uprouse