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.
pyro pro pyre prao proa prow pareo pur per pry par pere parr puri pore pair peer pier pray pour para poor peri pree prey pure prau purr pear pare pareu parae hyper poori puree parry perea peery perry