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.
drag draggy dreg drug drake druggy drogue dreggy druggie dirk drek trog dark trig dork trug daric darky dorky dreck drouk duroc terga track traik triac trigo troak