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.
petrol patrol petrel petrale peytral peytrel poitrel pteryla pterylae
petrol patrol dottrel sterol retral peytrel droll drool tirl triol troll beadroll bedroll vitriol mitral neutral nitril outroll petrel peytral poitrel citral stroll tetryl
peatier pedro peter petter pettier pewter poetry