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.
spleen spleeny spelean splenia splenii spelaean spline seaplane sepaline cipolin zeppelin
spleen plena pleon poleyn pollen napoleon spelean spleeny
spale spall speel speil spell spiel spile spill splay