fall back vs retrogress

fall back and retrogress both are verbs.

Word	Noun	Adjective	Verb	Adverb
fall back	No	No	Yes	No
retrogress	No	No	Yes	No

As verbs, fall back and retrogress are synonyms defined as:

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

As verbs, retrogress is a hypernym of fall back; that is, retrogress is a word with a broader meaning than fall back:

Other hypernyms of fall back include regress, retrograde.

fall back (verb)	retrogress (verb)
go back to bad behavior	go back to bad behavior
retreat	get worse or fall back to a previous condition
hang (back) or fall (behind) in movement, progress, development, etc.
fall backwards and down
move back and away from
have recourse to