perturb vs perturbation

perturb is not a noun while perturbation is a noun.

Word	Noun	Adjective	Verb	Adverb
perturb	No	No	Yes	No
perturbation	Yes	No	No	No

perturb (noun)	perturbation (noun)
	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

perturb (verb)	perturbation (verb)
throw into great confusion or disorder
disturb in mind or make uneasy or cause to be worried or alarmed
cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull
disturb or interfere with the usual path of an electron or atom