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