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.
deify defy def dif deaf defi diff divvy daffy dieoff dev dove tiff teff duff daff doff dive diva deva davy tivy
deify reify beefy biffy iffy jiffy leafy miffy neif reefy reif seif defy wifey