noun (n)

• complete annihilation(noun.event)

  Synonym:
  extinction
  

  source: wordnet30
• the act of exterminating(noun.act)

  Synonym:
  liquidation
  

  source: wordnet30
• The act of exterminating; total destruction; eradication; excision; as, the extermination of inhabitants or tribes, of error or vice, or of weeds from a field.(noun)

  source: webster1913