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.
griffes griffs gruffs griefs grieves gravies grievous groves graves grooves carafes curfews garveys greaves curfs kerfs carves corves craves curves graphs corvees crevice
griffes reifies riffs ruffes aerifies verifies horrifies giraffes griffs purifies rarifies tariffs terrifies torrifies truffes sheriffs
griff griffe grief gruff gruffy