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.
duck ducky duckie dick tuck deck duke dock dicky dickey dickie dak dug doc tick dawk deke deco dike tack dyke decay decoy dekko dikey dykey tacky
buck fuck huck guck luck muck puck ruck suck duck tuck chuck shuck yuck