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.
classier classer glassier glossier closer glacier glazier glosser colessor glaziery glazer closure glossary
flossier classier glassier glossier lassoer lesser lousier ballsier blesser blousier blowsier bluesier flosser classer glosser
class classy clause claws clays colas glass glassie glassy