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.
dumper dumpier damper tamper temper tempera tempura
bumper pamper romper hamper jimper limper jumper camper tamper simper chomper temper lumper champer dumper whimper vamper pumper mumper humper damper hempier compeer compere lumpier jumpier mopery mopper moper campier ampere mopier dumpier sempre gimpier wimpier humpier vampier empery pampero mapper bumpier tempera