Pearl Harbor was (and is) a harbor, and it was (and is) the location of a U.S. Naval Station that is named U.S. Naval Station Pearl Harbor.
It is a harbor. It is located on the island of Oahu.
a harbor is a port or a safe place
In shipping it is a place where ships are docked loaded and repaired. A harbor can also describe a place of safety in many other situations. Or it is a body of water along the shore that is deep...
It is a Base or line of Boats, And Navy/ Airforce marine use