unreactive vs chemical science

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

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

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

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