relapse vs recidivate

relapse is a noun but recidivate is not a noun.

Word	Noun	Adjective	Verb	Adverb
relapse	Yes	No	Yes	No
recidivate	No	No	Yes	No

As verbs, relapse and recidivate are synonyms defined as:

Other synonyms of relapse include fall back, lapse, regress, retrogress.

relapse (noun)	recidivate (noun)
a failure to maintain a higher state

relapse (verb)	recidivate (verb)
go back to bad behavior	go back to bad behavior
deteriorate in health