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.
dieoff diff doff def dif daff deaf defy duff dive teff tiff toff daffy deify toffy toffee dev
dieoff feoff eff off boff boffo howff coff pouff doff teff toff toffy
die adieu dido died diet diode dite