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.
dreg dreggy drug drag drek drake dreck darkey drogue darkie drecky druggy draggy druggie dark trig trog dork trek dirk trug daric darky dorky drouk duroc terga trigo trike troke