center of buoyancy vs natural philosophy

center of buoyancy and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
center of buoyancy	Yes	No	No	No
natural philosophy	Yes	No	No	No

center of buoyancy (noun)	natural philosophy (noun)
(physics) the center of mass of the immersed part of ship or other floating object	the science of matter and energy and their interactions