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Synonyms for Catastrophe (same or very similar meaning)

WordNet sense 1 (a state of extreme (usually irremediable) ruin and misfortune):

WordNet sense 2 (a sudden violent change in the earth's surface):

WordNet sense 3 (an event resulting in great loss and misfortune):
calamity, tragedy

From the ODE community, based on WordNetadd/edit