earthquake vs disturbance

earthquake and disturbance both are nouns.

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

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

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

earthquake (noun)	disturbance (noun)
shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity	the act of disturbing something or someone; setting something in motion
a disturbance that is extremely disruptive	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