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.
hyponoias hyponeas ponies peonies pons pones pinas peons punas pians penis poons pions peones pianos pennis paeons pinnas pennies pinnies pans puns pens pins pains peens peins penes pines ponce panes pawns peans