cave in vs founder

cave in and founder both are nouns.

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

As verbs, cave in and founder are synonyms defined as:

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

cave in (noun)	founder (noun)
the sudden collapse of something into a hollow beneath it	a person who founds or establishes some institution
	a worker who makes metal castings
	inflammation of the laminated tissue that attaches the hoof to the foot of a horse

cave in (verb)	founder (verb)
break down, literally or metaphorically	break down, literally or metaphorically
	sink below the surface
	stumble and nearly fall
	fail utterly; collapse