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.
beefalos beefaloes befalls beefless buffalos bevels buffaloes befleas befools befouls biofuels boffolas
buffalos beefalos cephalous fails falls false filos floes floss foals flows beefaloes befalls buffaloes offals refalls reflows dewfalls