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