tragedy vs cataclysm

tragedy and cataclysm both are nouns.

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

As nouns, tragedy and cataclysm are synonyms defined as:

Other synonyms of tragedy include calamity, catastrophe, disaster.

tragedy (noun)	cataclysm (noun)
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
an event resulting in great loss and misfortune	a sudden violent change in the earth's surface