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.
sempre semipro simper
sempre impure champer umpire tamper damper jimper pumper mumper empire vamper vampire hamper humper bumper jumper ampere camper compare compere lamprey limper lumper pamper romper simper dumper temper whimper chomper