natural philosophy vs classical

natural philosophy and classical both are nouns.

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

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

natural philosophy (adjective)	classical (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