IN my reasearch I found that gold swords are the weakest swords.I did some test by killing 20 zombie pigmen.It only took 9 seconds for the gold sword to die.So I did more test to see what the order from least to greatest power was and the order was gold,wood,stone,iron and dimond. Surpriseingly the wood took 46 seconds to die the stone dident die nore the iron or diemond.