WordNet (r) 3.0 (2006):

bombing
    n 1: an attack by dropping bombs [syn: bombing, bombardment]
    2: the use of bombs for sabotage; a tactic frequently used by
       terrorists

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "bombing":
   air cover, air raid, air support, area bombing, blitz,
   carpet bombing, cover, dive-bombing, dry run,
   high-altitude bombing, low-altitude bombing, milk run, mission,
   precision bombing, reconnaissance, reconnaissance mission,
   saturation bombing, scramble, shuttle bombing, shuttle raid,
   skip-bombing, sortie, strafing, strategic bombing,
   tactical bombing, training mission, umbrella