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