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.
wipes whips waps weepies whipsaw wops whoopees whoopies weeps whaps whops whups woops whaups wheeps whoops
ripes wipes pipes yipes sipes pes apes rips zips guppies dupes mopes nappes cowpies spews rapes ropes opes sips gapes buppies teepees mips hoopoes loupes epees poppies copes tipsy types yips lips ships chips cheapies chapes whoopies whips taupes topes rappees tipis coupes jupes hips pips spues nipas hopes gipsy cepes pees quipus napes pehs pappies dips dopes peas peso popes koppies rupees pies kewpies kips cowpeas nappies spaes japes peps shapes shoppes nips quips hippies dipso veepees lopes pews copies spies capes tepees tawpies puppies hypes topees tapes toupees weepies whoopees gips tips chappies chippies supes yippies yuppies