Synonyms for cataclysm

Noun

1. catastrophe, cataclysm, geological phenomenon

usage: a sudden violent change in the earth's surface

2. calamity, catastrophe, disaster, tragedy, cataclysm, misfortune, bad luck

usage: an event resulting in great loss and misfortune; "the whole city was affected by the irremediable calamity"; "the earthquake was a disaster"