crisis vs exigency

crisis and exigency both are nouns.

Word	Noun	Adjective	Verb	Adverb
crisis	Yes	No	No	No
exigency	Yes	No	No	No

As nouns, exigency is a hyponym of crisis; that is, exigency is a word with a more specific, narrower meaning than crisis:

crisis: a crucial stage or turning point in the course of something
exigency: a sudden unforeseen crisis (usually involving danger) that requires immediate action

Other hyponyms of crisis include emergency, pinch.

As nouns, exigency is a hyponym of crisis; that is, exigency is a word with a more specific, narrower meaning than crisis:

Other hyponyms of crisis include Dunkirk, critical point, crossroads, juncture, depression, economic crisis, slump.

crisis (noun)	exigency (noun)
a crucial stage or turning point in the course of something	a sudden unforeseen crisis (usually involving danger) that requires immediate action
an unstable situation of extreme danger or difficulty	a pressing or urgent situation
	that which is required in a particular situation —usually used in plural.