WordNet (r) 3.0 (2006):

gunfire
    n 1: the act of shooting a gun; "the gunfire endangered innocent
         bystanders"; "they retreated in the face of withering enemy
         fire" [syn: gunfire, gunshot]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "gunfire":
   antiaircraft fire, bowshot, bullet, cannon, cross fire,
   curtain fire, detonation, direct fire, discharge, dry fire,
   ejection, file fire, fire, fire of demolition, firepower,
   fireworks, firing, flack, flak, fusillade, ground fire, gun,
   gunfight, gunplay, gunshot, high-angle fire, horizontal fire,
   interdiction fire, machine-gun fire, mortar fire, musketry,
   percussion fire, pistol fire, potshot, raking fire, rapid fire,
   ricochet fire, rifle fire, salvo, shellfire, shoot-out, shooting,
   shot, spray, stoneshot, tattoo, time fire, vertical fire, volley,
   zone fire