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