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.
trogon trigon tarragon dragon dragoon
trogon jargony trigon dragoon progun perigon paragon orgone gorgon jargoon racoon rockoon fourgon forgone foregone brogan barracoon argon dragon tarragon jargon
trog drogue taroc tarok terga trig trigo troak trock troika troke trug stroke strook