physics vs metastable

physics is a noun but metastable is not a noun.

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

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

physics (adjective)	metastable (adjective)
	(of physical systems) continuing in its present state of equilibrium unless sufficiently disturbed to pass to a more stable state of equilibrium