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.
showier shower showery shewer chewier chawer chewer
cowier showier shower power showery chewier towery dowery dower dewier sower rower mower twier lowery bower lower cower vower viewier bowery tower knower