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