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.
polenta plenty pollenate plant pollened plaint planet pliant pollinate planed plained planate planned
polenta lent leant lento blent eluent fluent violent client plenty relent salient silent diluent talent cholent
plena pleon poleyn pollen splenia splenii