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