exigent vs exigency

exigent is not a noun while exigency is a noun.

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

exigent (noun)	exigency (noun)
	a sudden unforeseen crisis (usually involving danger) that requires immediate action
	a pressing or urgent situation
	that which is required in a particular situation —usually used in plural.

exigent (adjective)	exigency (adjective)
requiring precise accuracy
demanding attention