critical vs faultfinding

critical is not a noun while faultfinding is a noun.

Word	Noun	Adjective	Verb	Adverb
critical	No	Yes	No	No
faultfinding	Yes	Yes	No	No

critical (noun)	faultfinding (noun)
	persistent petty and unjustified criticism

critical (adjective)	faultfinding (adjective)
marked by a tendency to find and call attention to errors and flaws	tending to find and call attention to faults
characterized by careful evaluation and judgment	tending to make moral judgments or judgments based on personal opinions
being in or verging on a state of crisis or emergency
at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass to sustain a chain reaction
of or involving or characteristic of critics or criticism
forming or having the nature of a turning point or crisis
urgently needed; absolutely necessary