retrogress vs lapse

retrogress is not a noun while lapse is a noun.

Word	Noun	Adjective	Verb	Adverb
retrogress	No	No	Yes	No
lapse	Yes	No	Yes	No

As verbs, retrogress and lapse are synonyms defined as:

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

retrogress (noun)	lapse (noun)
	a mistake resulting from inattention
	a failure to maintain a higher state
	a break or intermission in the occurrence of something

retrogress (verb)	lapse (verb)
go back to bad behavior	go back to bad behavior
get worse or fall back to a previous condition	drop to a lower level, as in one's morals or standards
	end, at least for a long time
	for time to move forward
	pass into a specified state or condition; sink into
	let slip