retroversion vs retroflexion

retroversion and retroflexion both are nouns.

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

As nouns, retroversion and retroflexion are synonyms defined as:

retroversion and retroflexion: a turning or tilting backward of an organ or body part

Other synonyms of retroversion include retroflection.

retroversion (noun)	retroflexion (noun)
returning to a former state	the act of bending backward
translation back into the original language	an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth
a turning or tilting backward of an organ or body part	a turning or tilting backward of an organ or body part