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.
graft grift kraft craft graffiti graffito crafty gravity graphite croft cravat graved grivet gravid graphed gravida greaved gruffed crowfeet crowfoot gravidae
raft craft graft kraft draft reft rift bereft crafty croft grift drafty drift shrift
graph grave gravy greave griff griffe gruff gruffy agrafe agraffe agrapha agraphia