noun (n)

• a sudden and severe onset of trouble(noun.event)

  source: wordnet30
• (military) an offensive against an enemy (using weapons)(noun.act)

  Synonym:
  attack, onrush, onset
  

  source: wordnet30
• the rapid and continuous delivery of linguistic communication (spoken or written)(noun.communication)

  Synonym:
  barrage, bombardment, outpouring
  

  source: wordnet30
• An attack; an onset; esp., a furious or murderous attack or assault.(noun)

  source: webster1913