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.
gowd god good goad goody goodie got gad cod code guid gout gaed coed coda gaud gadi gude goat quod cooed coude gaddi gaudy gouty guide kotow