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.
redans redons radians retains reddens redness redenies reattains readiness radons reediness ratans retines ratoons rattens rattans retinas rattons retunes retenes rudeness riddance retinues rattoons ratteens ratanies radiancy radiance rottenness rutins ratines rhytons routines
dans soudans dedans redans sedans deadens rattans middens medians deans dens dins hoddens cotans mueddins lodens codens stains maidens maddens dawns tains tans redons cetanes duns dons butanes detains titans widens shaitans codons voduns radons loudens hoydens attains guidons soutanes hoddins tansy gitanos phytanes seitans voudons suddens stanes hoidens soddens radians boudins ratans leadens reddens retains saddens ladens reattains iodins tetanus udons witans sheitans
redan reattain redden redeny redon redone retain creatin creatine greaten ordain preattune predawn uredinia