retroversion vs regression

retroversion and regression both are nouns.

Word	Noun	Adjective	Verb	Adverb
retroversion	Yes	No	No	No
regression	Yes	No	No	No

As nouns, retroversion and regression are synonyms defined as:

Other synonyms of retroversion include regress, retrogression, reversion.

retroversion (noun)	regression (noun)
returning to a former state	returning to a former state
translation back into the original language	the relation between selected values of x and observed values of y (from which the most probable value of y can be predicted for any value of x)
a turning or tilting backward of an organ or body part	(psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state
	an abnormal state in which development has stopped prematurely