critical vs natural philosophy

critical is not a noun while natural philosophy is a noun.

Word	Noun	Adjective	Verb	Adverb
critical	No	Yes	No	No
natural philosophy	Yes	No	No	No

critical (noun)	natural philosophy (noun)
	the science of matter and energy and their interactions

critical (adjective)	natural philosophy (adjective)
marked by a tendency to find and call attention to errors and flaws
characterized by careful evaluation and judgment
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