slate-grey vs neutral

slate-grey is not a noun while neutral is a noun.

Word	Noun	Adjective	Verb	Adverb
slate-grey	No	Yes	No	No
neutral	Yes	Yes	No	No

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

slate-grey (adjective)	neutral (adjective)
of the color of slate or granite	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