natural philosophy vs perturbation

natural philosophy and perturbation both are nouns.

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

natural philosophy (noun)	perturbation (noun)
the science of matter and energy and their interactions	the act of causing disorder
	a disposition that is confused or nervous and upset
	activity that is a malfunction, intrusion, or interruption
	(physics) a secondary influence on a system that causes it to deviate slightly
	an unhappy and worried mental state