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.
duke duckie duck dyke dike deke dykey dikey ducky dickey dickie dak dug dick dawk take toke deck tike deco tuck dock tyke decay decoy dekko dicky togue toque tuque