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.
deaf def daff defi defy deva deify deave daffy dieoff dif dev davy diff diva dive doff dove duff teff taffy tafia