give up vs cave in

give up is not a noun while cave in is a noun.

Word	Noun	Adjective	Verb	Adverb
give up	No	No	Yes	No
cave in	Yes	No	Yes	No

give up (noun)	cave in (noun)
	the sudden collapse of something into a hollow beneath it

give up (verb)	cave in (verb)
stop maintaining or insisting on; of ideas or claims	break down, literally or metaphorically
give up in the face of defeat of lacking hope; admit defeat
give up or agree to forgo to the power or possession of another
stop consuming
give up with the intent of never claiming again
relinquish possession or control over
lose (something) or lose the right to (something) by some error, offense, or crime
part with a possession or right
give up what is not strictly needed
allow the other (baseball) team to score
leave (a job, post, or position) voluntarily
put an end to a state or an activity