God works through agents whether messengers or deputies.
When messengers speak for God, they speak as if they are God, because they are his agents.
God's original intention for making humanity in his image was that we would rule over the world for him.
God's representatives include his divine counsel, judges, priests, and kings.
Because God's agents represent him, the Bible occasionally calls them Gods/gods.
As God's supreme agent, the Messiah is properly called God/god in this secondary sense (Heb 1:8)
Out of the seven dictionaries I checked, all of them recognize that a human can be called “God”.