calamity vs catastrophe

calamity and catastrophe both are nouns.

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

As nouns, calamity and catastrophe are synonyms defined as:

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

Other synonyms of calamity include cataclysm, disaster, tragedy.

calamity (noun)	catastrophe (noun)
an event resulting in great loss and misfortune	an event resulting in great loss and misfortune
	a sudden violent change in the earth's surface
	a state of extreme (usually irremediable) ruin and misfortune