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.
gruffs griffs griffes griefs grievous kerfs curfs graphs graves groves carafes curfews garveys gravies greaves grieves grooves
gruffs ruffs raffs riffs ruffes giraffes curfs griffes griffs surfs draffs tariffs truffes turfs sheriffs shroffs