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.
people popple pepla papule peepul peppily papal pipal pupal pupil papula papally papilla
people fipple zeppole spile ripple pele nipple opal cupule maple couple copal hopple hoopla topple duple wheeple diploe apple pale maypole dipole dapple supple spale popple nopal papule pule pile plea plew plie pole uppile tipple whoopla
pep pop peep pepo peppy poop poppa poppy epopee epopoeia