worsening vs slump

worsening and slump both are nouns.

Word	Noun	Adjective	Verb	Adverb
worsening	Yes	Yes	No	No
slump	Yes	No	Yes	No

As nouns, slump is a hyponym of worsening; that is, slump is a word with a more specific, narrower meaning than worsening:

Other hyponyms of worsening include drop-off, falling off, falloff, slack.

worsening (noun)	slump (noun)
changing something with the result that it becomes worse	a noticeable deterioration in performance or quality
process of changing to an inferior state	a long-term economic state characterized by unemployment and low prices and low levels of trade and investment

worsening (adjective)	slump (adjective)
changing for the worse

worsening (verb)	slump (verb)
	fall heavily or suddenly; decline markedly
	fall or sink heavily
	assume a drooping posture or carriage
	fall in value