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