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