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