apocalypse vs disaster

apocalypse and disaster both are nouns.

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

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

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

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

apocalypse (noun)	disaster (noun)
a cosmic cataclysm in which God destroys the ruling powers of evil	an act that has disastrous consequences
	an event resulting in great loss and misfortune
	a state of extreme (usually irremediable) ruin and misfortune