"cataclysm" in the noun sense
1. catastrophe, cataclysm
a sudden violent change in the earth's surface
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"
Source: WordNet® (An amazing lexical database of English)
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