hassle vs perturbation

hassle and perturbation both are nouns.

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

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

Other hypernyms of hassle include disturbance.

hassle (noun)	perturbation (noun)
disorderly fighting	the act of causing disorder
an angry disturbance	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

hassle (verb)	perturbation (verb)
annoy continually or chronically