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.
pier per peri peer pair pere pear perry perea peery hyper pereia peerie pro pur par pry para pyre parr puri pure proa prey pray pore pour poor prao pare prau prow purr pree pyro parae pareo pareu parry poori puree
bier vier gooier kier lier pier wrier zooier doughier tier shier er