tsunami vs tragedy

tsunami and tragedy both are nouns.

Word	Noun	Adjective	Verb	Adverb
tsunami	Yes	No	No	No
tragedy	Yes	No	No	No

As nouns, tragedy is a hypernym of tsunami; that is, tragedy is a word with a broader meaning than tsunami:

tsunami: a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption
tragedy: an event resulting in great loss and misfortune

Other hypernyms of tsunami include calamity, cataclysm, catastrophe, disaster, moving ridge, wave.

tsunami (noun)	tragedy (noun)
a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption	drama in which the protagonist is overcome by some superior force or circumstance; excites terror or pity
	an event resulting in great loss and misfortune