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.
plonk plank plunk plink plunky pleonic paling puling piling poling palling pealing peeling pilling polling pooling pulling pollinic
clonk plonk slunk slank plunk plank flong plink oolong kalong clunk clink clank flank flunk klong lank blank belong along lunk long link blink relink slink daylong
pelon plan plane plena pleon pylon