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.
petrel peytrel petrol petrale peytral poitrel patrol pteryla pterylae
petrel dottrel peytrel poitrel peytral neutral dotterel patrol sidereal citral retral nitril petrol mitral maturely materiel tirl direly streel tetryl
peatier pedro peter petter pettier pewter poetry