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.
weepies weeps wheeps whoopies wipes waps wops whoopees whaps whips whops whups woops whaups whoops whipsaw
weepies pies yippies cheapies whoopies teepees spies tepees tawpies sepias puppies pipes pappies nappies koppies kewpies buppies guppies cowpies copies hippies veepees epees poppies cepes kepis chappies chippies yuppies pes pis
weepie weep weepy wheep sweep sweepy