natural philosophy vs coherent

natural philosophy is a noun but coherent is not a noun.

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

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

natural philosophy (adjective)	coherent (adjective)
	marked by an orderly, logical, and aesthetically consistent relation of parts
	(physics) of waves having a constant phase relation
	sticking together
	capable of thinking and expressing yourself in a clear and consistent manner