earthquake vs hurly burly

earthquake and hurly burly both are nouns.

Word	Noun	Adjective	Verb	Adverb
earthquake	Yes	No	No	No
hurly burly	Yes	No	No	No

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

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

earthquake (noun)	hurly burly (noun)
shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity	a disorderly outburst or tumult
a disturbance that is extremely disruptive