regress vs recuperate

regress is a noun but recuperate is not a noun.

Word	Noun	Adjective	Verb	Adverb
regress	Yes	No	Yes	No
recuperate	No	No	Yes	No

As verbs, recuperate is a hyponym of regress; that is, recuperate is a word with a more specific, narrower meaning than regress:

Other hyponyms of regress include fall back, lapse, recidivate, regress, relapse, retrogress, resile, go back, recover.

regress (noun)	recuperate (noun)
returning to a former state
the reasoning involved when you assume the conclusion is true and reason backward to the evidence

regress (verb)	recuperate (verb)
go back to bad behavior	get over an illness or shock
get worse or fall back to a previous condition	restore to good health or strength
go back to a previous state	regain a former condition after a financial loss
go back to a statistical means	regain or make up for