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.
cheapness cheapens choppiness chopines chopins shippens shippons
cheapness nippiness happiness dopiness deepness soapiness sappiness ropiness ripeness rapines pipiness peppiness nappiness apneas mopiness loopiness lippiness hippiness hipness soppiness dippiness weepiness choppiness