retroflexion vs motility

retroflexion and motility both are nouns.

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

As nouns, motility is a hypernym of retroflexion; that is, motility is a word with a broader meaning than retroflexion:

Other hypernyms of retroflexion include motion, move, movement.

retroflexion (noun)	motility (noun)
the act of bending backward	a change of position that does not entail a change of location
an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth	ability to move spontaneously and independently
a turning or tilting backward of an organ or body part