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.
goad god gad goat gaed gowd gadi gaud good gaudy gaddi goody goatee goodie got gat cod cad kadi cade coed cadi gait quod qaid code gude caid coat gout guid coda qadi quad gate guide caddy gutta coati gouty coude cotta cooed quota
goad load road toad woad ad od