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