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