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.
peans paeans pens pans pains pansy peins penis pians penes panes peens pawns peons pensee paeons peones pannes pianos pennis pennies puns peonies pins pons hyponeas punas pions pines pinas pones poons pence pinnas ponies panacea pawnees pinnies hyponoias
beans yeans jeans weans leans means deans peans queans paeans ens faenas aeons fawns bens fauns lawns lens pawns awns genus koans hyphens kanas gens ains beanos naans fans anis peens banns hymens ansa canes benes cans dense lenis wrens mains canso loans guineas lenos yawns nanas tens wains dienes sense scenes tineas tans sans weens queens wens whenas teens chains dens hyaenas yens dans wans penes unease rains rouens nans cains pens reins hygienes sains mensa pianos lense llanos kaons pans manse guans vanes anas manes hyponeas peons pians menus hansa venus banes fens keens mense sensa hanse veins liens hens manas foehns kains dawns vans lanes pansy janes lianes guanos manus veenas lenes bans gains manos kenos kens neons pains uneasy lauans fanos eons kanes nenes roans anes miens cense peins lianas penis zeins paeons anus mans fanes tense sanes denes weensy ranis panes scenas moans tansy ruanas wanes tonneaus wheens whens teensy sheens tains hyenas genes yuans
pean pan pen span piano peony penny paean pain pane panne pawn pawnee peen penni pennia pein peon penna pian pennae open penne spean