Gunshot
A gunshot is the discharge of a firearm. It produces a mechanical sound effect and a chemical gunshot residue. The term can also refer to a gunshot wound caused by the bullet. Multiple discharges of a firearm or firearms are referred to as gunfire. The word can mean either the sound of a gun firing, the projectiles that were fired, or both.  For example, the statement "gunfire came from the next street" could either mean the sound of discharge, or it could mean the bullets themselves.  It is better to be more specific while writing however. "The sound of gunfire" or "we came under gunfire" would be more descriptive and prevent confusion.