unreactive vs physics

unreactive is not a noun while physics is a noun.

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

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

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