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.
grief griff grieve griffe grave grove gruff garvey greave groove gruffy corf curf kerf
grief brief ref rif sheriff rarefy shereef reef arrive reif torrify rife terrify riff drive rive whereof serif aerify derive horrify tariff griff torrefy purify tref verify sharif rarify sherif hereof shrive
gore gree grew grey grue agree agria ogre