(the sound of) the shooting of a gun:
I then heard what sounded like a gunshot in the hall.
gunshot wounds
(the sound of) the shooting of a gun:
I then heard what sounded like a gunshot in the hall.
gunshot wounds
the shooting of a gun, or the sound this makes:
I hear gunshots in the forest sometimes.
the bullets shot from a gun:
He suffered a gunshot wound in the thigh.