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