cave in vs slump

cave in and slump both are nouns.

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

As verbs, slump is a hyponym of cave in; that is, slump is a word with a more specific, narrower meaning than cave in:

Other hyponyms of cave in include go off, implode, buckle, crumple, flop, break, sink, slide down.

cave in (noun)	slump (noun)
the sudden collapse of something into a hollow beneath it	a noticeable deterioration in performance or quality
	a long-term economic state characterized by unemployment and low prices and low levels of trade and investment

cave in (verb)	slump (verb)
break down, literally or metaphorically	fall heavily or suddenly; decline markedly
	fall or sink heavily
	assume a drooping posture or carriage
	fall in value