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