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.
trug drug trig trog truck terga trigo druggy torque turacou druggie torc drag trek dreg turk track triac trick drouk troke traik troak toric tarok trock trike taroc