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.
newwaver never naiver knavery navar knifer niffer nigher
newwaver waver aver laveer wiver quavery wavier saver quaver raver naiver knavery leavier leaver laver heaver caver haver beaver aiver paver reaver suaver waiver heavier wafer wavery weaver shaver