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.
trigon trogon tarragon dragon dragoon
perigon trigon argon tarragon foregone forgone fourgon jargon jargony larrigan jargoon gorgon lyricon orgone origan paragon dragon dragoon trogon
trigo trig terga toric traik triac trick trickie tricky trike trog troika trug strick strike