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.
pons poons pones pions peons peones paeons ponies pens puns pans pins peonies pains pinas punas hyponeas peens pawns peans penes peins panes pansy pians pines ponce penis hyponoias pinnas pensee paeans pannes pounce pennis pianos pawnees pennies pinnies pence
boons cons toons tauons zoons scions cions pons peons ons neons eons fons phons hons ions aeons goons paeons tons dons sons hysons poons pions noons coons muons moons mons loons lions kaons wons