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.
popple people papule papulae peppily papillae papal pepla pipal pupal pupil papula peepul papally papilla
fipple hopple popple topple ripple nipple dapple tipple apple supple plew spale ripply pile pale maypole apply maple reapply dipole papule uppile spile duple cupule pole diploe rappel supply pele plea appal appel zeppole couple people plie pule wheeple
poppa poppy pop pappi pappy peppy poop pope puppy epopee epopoeia