incident vs disturbance

incident and disturbance both are nouns.

Word	Noun	Adjective	Verb	Adverb
incident	Yes	Yes	No	No
disturbance	Yes	No	No	No

As nouns, disturbance is a hypernym of incident; that is, disturbance is a word with a broader meaning than incident:

Other hypernyms of incident include commotion, disruption, flutter, hoo-ha, hoo-hah, hurly burly, kerfuffle, to-do.

incident (noun)	disturbance (noun)
a single distinct event	the act of disturbing something or someone; setting something in motion
a public disturbance	a noisy fight
	activity that is a malfunction, intrusion, or interruption
	electrical or acoustic activity that can disturb communication
	a disorderly outburst or tumult
	(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness
	an unhappy and worried mental state

incident (adjective)	disturbance (adjective)
(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
falling or striking of light rays on something