chemical science vs unreactive

chemical science is a noun but unreactive is not a noun.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
unreactive	No	Yes	No	No

chemical science (noun)	unreactive (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

chemical science (adjective)	unreactive (adjective)
	(chemistry) not reacting chemically
	not tending to react to stimulation