lapse vs regress

lapse and regress both are nouns.

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

As verbs, lapse and regress are synonyms defined as:

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

As verbs, regress is a hypernym of lapse; that is, regress is a word with a broader meaning than lapse:

Other hypernyms of lapse include retrovert, return, revert, turn back.

lapse (noun)	regress (noun)
a mistake resulting from inattention	returning to a former state
a failure to maintain a higher state	the reasoning involved when you assume the conclusion is true and reason backward to the evidence
a break or intermission in the occurrence of something

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