retroflection vs retroflexion

retroflection and retroflexion both are nouns.

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

As nouns, retroflection and retroflexion are synonyms defined as:

As nouns, retroflection and retroflexion are synonyms defined as:

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

As nouns, retroflection and retroflexion are synonyms defined as:

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

Other synonyms of retroflection include retroversion.

retroflection (noun)	retroflexion (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