tsunami

English Thesaurus

1. a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption (noun.event)

hypernym	:	calamity, cataclysm, catastrophe, disaster, tragedy,
definition	:	an event resulting in great loss and misfortune (noun.event)

hypernym	:	moving ridge, wave,
definition	:	one of a series of ridges that moves across the surface of a liquid (especially across a large body of water) (noun.event)