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Nephilim
A group of mysterious beings or people of unusually large size and strength who lived both before and after the Flood. It is possible the Nephilim were somewhat both fallen angels and giants. According to Genesis, the Nephilim were the children of the relations between the sons of God and daughters of men (Genesis 6:1-4) (Numbers 13:33).
Nimrod
A foolish or inept person; doofus; A person regarded as stupid, foolish, awkward. It comes from the Hebrew verb marad, meaning “rebel.” The Bible calls Nimrod “a mighty hunter before the Lord.”, which doesn't exactly match above definition.