apocalypse vs tragedy

apocalypse and tragedy both are nouns.

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

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

apocalypse: a cosmic cataclysm in which God destroys the ruling powers of evil
tragedy: an event resulting in great loss and misfortune

Other hypernyms of apocalypse include calamity, cataclysm, catastrophe, disaster.

apocalypse (noun)	tragedy (noun)
a cosmic cataclysm in which God destroys the ruling powers of evil	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