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.
puns punas pens pans pons pins pawns peins panes poons pians peens penes penis pones pions pains peons pansy pines pinas peans pinnas paeans ponies pennis paeons peones pensee pianos pannes pounce pawnees pennies peonies pinnies hyponeas hyponoias pence ponce
buns fauns funs huns guns muns nouns nuns puns runs suns duns tuns uns shuns