regress vs retrovert

regress is a noun but retrovert is not a noun.

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

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

Other hypernyms of regress include regress, return, revert, turn back.

As verbs, regress and retrovert are synonyms defined as:

Other synonyms of regress include return, revert, turn back.

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

regress (verb)	retrovert (verb)
go back to bad behavior	go back to a previous state
get worse or fall back to a previous condition
go back to a previous state
go back to a statistical means