emergent vs emergency

emergent is not a noun while emergency is a noun.

Word	Noun	Adjective	Verb	Adverb
emergent	No	Yes	No	No
emergency	Yes	No	No	No

emergent (noun)	emergency (noun)
	a brake operated by hand; usually operates by mechanical linkage
	a sudden unforeseen crisis (usually involving danger) that requires immediate action
	a state in which martial law applies

emergent (adjective)	emergency (adjective)
coming into existence
occurring unexpectedly and requiring urgent action