retroflection vs retroversion

retroflection and retroversion both are nouns.

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

As nouns, retroflection and retroversion are synonyms defined as:

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

Other synonyms of retroflection include retroflexion.

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