conservation of parity vs natural philosophy

conservation of parity and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
conservation of parity	Yes	No	No	No
natural philosophy	Yes	No	No	No

conservation of parity (noun)	natural philosophy (noun)
(physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system	the science of matter and energy and their interactions