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.
whups whaups whaps whips whops wheeps whoops waps whipsaw wops whoopees whoopies weeps wipes woops weepies
whups ups coups hyps coupes jupes jaups hops whaps supes roups dupes taupes upas quips chips ships yaups hips loups cups tups pupas pups pupus soups sups dups lupus haps whaups whops loupes whips chaps chops shops yups
whup whap whaup whip whippy whop