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.
yippee yippie yipe yip yuppie yuppy yap yep yup
rappee yippee pee yippie chippie koppie shoppe chappie toupee buppie epee veepee hippie nappe nappie pipe pope rupee teepee tepee topee peep whoopee yuppie