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.
quietens quietness ketenes kittens cuteness cutins catenas guidons ketones gaudiness goutiness quittance coetaneous codens cotans
quietens tens heightens jetons catenas ketenes kittens latens luteins phaetons pattens potteens rattens sateens steins dudeens wheatens neatens etnas fattens lattens betons battens tense teensy teens lateens butenes mittens patens poteens ratteens retenes setons stenos tautens whitens