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.
toffy toff taffy toffee tofu tuff tiff teff doff daffy toughy taffia dieoff daff defy diff duff tivy toph tufa
toffy off chaffy taffy jiffy toff doff daffy pouffy poofy ofay miffy goofy iffy coff dieoff baffy howff feoff buffy boffo boff biffy pouff puffy huffy chuffy