metastable vs natural philosophy

metastable is not a noun while natural philosophy is a noun.

Word	Noun	Adjective	Verb	Adverb
metastable	No	Yes	No	No
natural philosophy	Yes	No	No	No

metastable (noun)	natural philosophy (noun)
	the science of matter and energy and their interactions

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