retroflexion vs retroflection

retroflexion and retroflection both are nouns.

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

As nouns, retroflexion and retroflection are synonyms defined as:

As nouns, retroflexion and retroflection are synonyms defined as:

retroflexion and retroflection: an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth

As nouns, retroflexion and retroflection are synonyms defined as:

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

Other synonyms of retroflexion include retroversion.

retroflexion (noun)	retroflection (noun)
the act of bending backward	the act of bending backward
an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth	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