pearl grey vs neutral

pearl grey is not a noun while neutral is a noun.

Word	Noun	Adjective	Verb	Adverb
pearl grey	No	Yes	No	No
neutral	Yes	Yes	No	No

pearl grey (noun)	neutral (noun)
	one who does not side with any party in a war or dispute

pearl grey (adjective)	neutral (adjective)
of a grey with a pearly tinge	having no hue
	possessing no distinctive quality or characteristics
	lacking distinguishing quality or characteristics
	not supporting or favoring either side in a war, dispute, or contest
	having no personal preference
	having no net electric charge
	having only a limited ability to react chemically; chemically inactive