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.
paeons peons paeans peones pons pens pans peonies pians pions pains pansy peins pones peans pawns penes poons peens panes penis pianos pennis pannes ponies pensee pawnees pennies pins puns hyponeas pence pinas pines ponce punas hyponoias pinnas panacea pinnace pinnies
eons aeons paeons peons neons ens ons ones mense liens hygienes ions hymens moons koans coons cones bens conus hens keens miens aeneous loons joins owns quoins poons bones pones muons queens hysons nenes kenos johns means faenas nones leones sensa gowns tauons tons dense scions donas donsy teensy wheens toons zoons weans whens sheens hyenas zeins yens denes tense onus weensy cions knowns peens hones penis kaons lenos sons roans monas pens kens penes fohns wrens venus rouens foehns genus lenes pons foins pions onos fons goons genes veenas jeans fens monos sense conns phones veins lions queans loins menus lenis lense phons loans coins phonos noons hons peones lens bonus hyphens scenas benes downs jones sones beans paeans mensa mons gens nouns reins weens boons peins leans peans cons moans cense nonas tones tonus dens scenes dienes dons teens wens zones tens towns whenas wons hyaenas sonsy yeans deans yonis