perturbation vs perturb

perturbation is a noun but perturb is not a noun.

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

perturbation (noun)	perturb (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

perturbation (verb)	perturb (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