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.
buppie buppy bap bop
buppie hippie koppie nappie yuppie chippie chappie yippie pie nappe whoopie pope shoppe rappee cowpie pipe weepie cheapie pappi yippee kewpie tawpie