neutral vs colourless

neutral is a noun but colourless is not a noun.

Word	Noun	Adjective	Verb	Adverb
neutral	Yes	Yes	No	No
colourless	No	Yes	No	No

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

neutral (adjective)	colourless (adjective)
having no hue	weak in color; not colorful
possessing no distinctive quality or characteristics	lacking in variety and interest
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