physics vs unreactive

physics is a noun but unreactive is not a noun.

Word	Noun	Adjective	Verb	Adverb
physics	Yes	No	No	No
unreactive	No	Yes	No	No

physics (noun)	unreactive (noun)
the science of matter and energy and their interactions
the physical properties, phenomena, and laws of something

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