cave in vs give way

cave in is a noun but give way is not a noun.

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

As verbs, cave in and give way are synonyms defined as:

Other synonyms of cave in include break, collapse, fall in, founder, give.

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

cave in (verb)	give way (verb)
break down, literally or metaphorically	stop operating or functioning
	end resistance, as under pressure or force
	move in order to make room for someone for something
	break down, literally or metaphorically