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