relativity vs natural philosophy

relativity and natural philosophy both are nouns.

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

relativity (noun)	natural philosophy (noun)
the quality of being relative and having significance only in relation to something else	the science of matter and energy and their interactions
(physics) the theory that space and time are relative concepts rather than absolute concepts