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.
peonies peones ponies pennies penis penes peons pones paeons pennis pons pens pinnies hyponeas pines panes peans pence pions poons ponce peens peins hyponoias pensee paeans pannes pawnees pans pins puns pains pansy pawns pians pinas punas pianos pinnas
phonies monies loonies conies toonies boonies ponies goonies peonies ones johnnies hyponeas tennies deionize looneys gunnies genies bonnes moneys honeys tones minnies hinnies nines meanies hones lioness shinnies whinnies tunnies ninnies meinies cones peones bones funnies nannies coneys lionise shannies lionize ionise jones tawnies pennies jennies tonnes gooneys pinnies donees koines leones beanies ionize pones bunnies heinies fannies sonnies townies donsie sonsie phoneys sheenies sanies phones sones zones lunies bennies denies zanies nones weenies wienies yonis ons
peon paeon penni pennia peony pen