classical vs natural philosophy

classical and natural philosophy both are nouns.

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

classical (noun)	natural philosophy (noun)
traditional genre of music conforming to an established form and appealing to critical interest and developed musical taste	the science of matter and energy and their interactions

classical (adjective)	natural philosophy (adjective)
of or relating to the first significant period of a civilization, culture, area of study, etc.
of or relating to the study of the literary works of ancient Greece and Rome
of or relating to the languages used by ancient standard authors
well-known and long-established in form or style
of or pertaining to or characteristic of the ancient Greeks and Romans, especially their art, literature, or culture
of or relating to music in the European tradition, such as symphonies and operas
(physics) relating to or based on concepts that preceded the theories of relativity and quantum mechanics