catastrophe vs tragedy

catastrophe and tragedy both are nouns.

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

As nouns, catastrophe and tragedy are synonyms defined as:

catastrophe and tragedy: an event resulting in great loss and misfortune

Other synonyms of catastrophe include calamity, cataclysm, disaster.

catastrophe (noun)	tragedy (noun)
an event resulting in great loss and misfortune	drama in which the protagonist is overcome by some superior force or circumstance; excites terror or pity
a sudden violent change in the earth's surface	an event resulting in great loss and misfortune
a state of extreme (usually irremediable) ruin and misfortune