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.
pansy pans peans pians pawns pains panes paeons pannes pianos paeans pins puns pawnees pons pens peens pones punas pions pinas penis penes peins peons poons pines pensee pinnas peones ponies pennis panacea pennies peonies pinnies hyponeas hyponoias
pansy tansy fauns pawns banes cains dans tains lauans vanes rains moans gains kains mains llanos beans manes nanas quinsy leans nosy hansa fanes guanos bans canso yeans roans chancy weensy mans wans wains sains uneasy sans nans pains pianos cans manus fanos pans koans deans lianes fancy kanes lawns janes jeans canes nancy manas anas dawns kanas queans kaons anis naans anes ansa ains anus beanos hanse awns fawns lianas gainsay lanes ranis vans guans paeans linsey sanes manos loans panes pians manse banns sonsy peans means tans teensy fans unsay wanes ruanas weans chains donsy yawns yuans
pan pain pane panne pawn pawnee pean pian piano span