perturbation vs activity

perturbation and activity both are nouns.

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

As nouns, activity is a hypernym of perturbation; that is, activity is a word with a broader meaning than perturbation:

perturbation (noun)	activity (noun)
the act of causing disorder	any specific behavior
a disposition that is confused or nervous and upset	the trait of being active; moving or acting rapidly and energetically
activity that is a malfunction, intrusion, or interruption	an organic process that takes place in the body
(physics) a secondary influence on a system that causes it to deviate slightly	a process existing in or produced by nature (rather than by the intent of human beings)
an unhappy and worried mental state	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction