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.
reddens redenies redans redons retenes redness rudeness ratteens ruddiness reediness readiness radons retains retinas rattens retines radians retunes riddance retinues reattains rottenness ratans rutins ratines ratoons rattans rattons rhytons
maddens hoddens reddens soddens saddens middens suddens dens mueddins dudeens maidens hoidens deans denes dense fadeins ladens hoydens odeons loudens codeins codens lodens leadens deadens hoddins widens