natural philosophy vs collision

natural philosophy and collision both are nouns.

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

natural philosophy (noun)	collision (noun)
the science of matter and energy and their interactions	a conflict of opposed ideas or attitudes or goals
	an accident resulting from violent impact of a moving object
	(physics) a brief event in which two or more bodies come together