I would go with adjective on this one.
My biggest fear is balloons.
I have a fear of balloons but not just looking at them, No No No. When they pop, fly away, or if I touch them that is what triggers my fear. At birthday parties I stay away from them and never have any at my own.
Its B, Gilgamesh holds Humbabas head to signal his ultimate defeat of the beast Humbaba and , thus , his strength.
Because he's looking for things to do.