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.
flappier flapper floppier flipper flopper
lippier floppier gloppier sloppier flappier slippier loppier lipper slipper flapper slapper lapper clipper loopier clapper flipper flopper sleepier lopper slippery gulpier pulpier