natural philosophy vs diffusion

natural philosophy and diffusion both are nouns.

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

natural philosophy (noun)	diffusion (noun)
the science of matter and energy and their interactions	the act of dispersing or diffusing something
	the property of being diffused or dispersed
	the spread of social institutions (and myths and skills) from one society to another
	(physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration