natural philosophy vs metastability

natural philosophy and metastability both are nouns.

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

natural philosophy (noun)	metastability (noun)
the science of matter and energy and their interactions	the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed