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.
gaudy gaud gad gaed gude gadi goad guid gouty gutty caddy guide cuddy goody gaddi gaiety gateau cad cud gut god gat gout quid qaid cadi cade caid gowd gate goat good gait cued kadi kudo kudu qadi quad quod
gaudy baddy shady waddy duddy ruddy paddy maud baud bawdy beady beauty buddy faddy fuddy heady caddy cuddy gaud lady laud leady muddy ready daddy toady wady yaud