founder vs cave in

founder and cave in both are nouns.

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

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

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

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

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