Noun cataclysm has 2 senses
  1. catastrophe, cataclysm - a sudden violent change in the earth's surface
    --1 is a kind of geological phenomenon
    --1 has particulars: nuclear winter
  2. calamity, catastrophe, disaster, tragedy, cataclysm - an event resulting in great loss and misfortune; "the whole city was affected by the irremediable calamity"; "the earthquake was a disaster"
    --2 is a kind of misfortune, bad luck
    --2 has particulars:
     act of God, force majeure, vis major, inevitable accident, unavoidable casualty; apocalypse; famine; kiss of death; meltdown; plague; visitation
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