cave in vs burst

cave in and burst both are nouns.

Word	Noun	Adjective	Verb	Adverb
cave in	Yes	No	Yes	No
burst	Yes	No	Yes	No

cave in (noun)	burst (noun)
the sudden collapse of something into a hollow beneath it	the act of exploding or bursting
	rapid simultaneous discharge of firearms
	a sudden flurry of activity (often for no obvious reason)
	a sudden intense happening

cave in (verb)	burst (verb)
break down, literally or metaphorically	come open suddenly and violently, as if from internal pressure
	break open or apart suddenly and forcefully
	emerge suddenly
	burst outward, usually with noise
	force out or release suddenly and often violently something pent up
	move suddenly, energetically, or violently
	cause to burst
	be in a state of movement or action