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.
cowpie cowpea cope coupe koppie kewpie cop cape coop coup copy copay coypu coypou cap cup kop
cowpie kewpie tawpie pie pipe yippie buppie hippie cowpea koppie nappie weepie wipe chappie cheapie chippie whoopie yuppie