give way vs cave in

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

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

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

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

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

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