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