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.
grift graft grivet gravity graffito graffiti graphite kraft craft croft gravid crafty gravida grieved gruffed crowfeet crowfoot gravidae
rift grift drift shrift raft reft bereft craft croft graft kraft draft drifty
griff griffe grief grieve gruff gruffy