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.
penes peones pens peonies pennies penis peons panes pones pence peans peens peins pines pennis paeons pensee pannes paeans ponies pinnies pins puns pawnees pons pans hyponeas pions pansy pawns pinas pians pains punas poons pianos pinnas hyponoias
benes lenes penes dienes nenes genes denes hygienes scenes ens means moneys eons phones venues fence lowness anes funnies gayness gooneys hinnies renews vanes faenas bones aeneus feyness janes johnnies foehns keens leones heinies paeons veenas jennies kanes sense bunnies miens newness boonies teens pannes pawnees kines nonnews zones bennies sinews paeans pinnies wrens lunies minnies reins dines coneys seines veins lianes hyphens peones bennes weenies wienies sonnies waeness wanness donees weensy dunness wheens panes whence whines toonies peens cense winoes chaines shannies tineas sheenies tones shines shinnies hyaenas townies yeans pens tawneys queans tennies conies jeans leans zines dens tunnies looneys tense sawneys lanes goonies faience dueness penis queens rouens peonies joannes zeins venus mensa meanies hones peons ranees honeys hymens monies pence gens aeons dense lioness denies teensy leanness bonnes ponies rawness wryness kenos sensa sines menus nowness fanes lense zanies fewness sanes pennies gunnies hyponeas liens mines pones scenas genus cones noes lunes meanness manes canoes news banes deans fines coyness kens jones gooeyness genies loonies lenos beanies guineas ninnies hence hens vainness ones fens lens weens vines canes knees lenis pines science tynes koines tenues bines lines peins tens beans fannies meinies sanies peans phonies nannies bens phoneys nones ness keenness mense dunes tawnies runes sones nines wanes weans donnees wens dynes whenas neons whens whinnies townees wines cines woeness chines sheeneys tines sheens tonnes shinneys shyness hyenas tunes yens
pen penne apnea pean peen pein penna pennae pane pennia penni penny peon peony pine piney pone open