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