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.
poons pons peons pions pones ponies paeons peones peonies puns pans pens pins hyponeas pians pawns punas pains ponce pines peans penis pinas penes pansy peens panes peins hyponoias pannes pinnas pianos paeans pounce pensee pennis pawnees pennies pinnies
boons coons poons goons zoons noons loons toons moons ons joins sonsy peons coins conns fons aeons gowns sons koans nones eons pons mons monos donsy owns ions wons phonos foins neons leones cons muons phones noose peones donas tauons nouns tons hones loans loins hons scions zones ones jones bones bonus knowns lions cones nonas pones conus onus monas phons paeons johns cions fohns kaons moans onos roans hysons sones pions dons downs tones quoins tonus towns yonis
poon peon peony pion pone pony spoon spooney spoony upon