Newton's law of gravitation vs natural philosophy

Newton's law of gravitation and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Newton's law of gravitation	Yes	No	No	No
natural philosophy	Yes	No	No	No

Newton's law of gravitation (noun)	natural philosophy (noun)
(physics) the law that states any two bodies attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them	the science of matter and energy and their interactions