dorsiflexion vs flexure

dorsiflexion and flexure both are nouns.

Word	Noun	Adjective	Verb	Adverb
dorsiflexion	Yes	No	No	No
flexure	Yes	No	No	No

As nouns, flexure is a hypernym of dorsiflexion; that is, flexure is a word with a broader meaning than dorsiflexion:

dorsiflexion: the act of bending backward (of the body or a body part)
flexure: act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased

Other hypernyms of dorsiflexion include flexion.

dorsiflexion (noun)	flexure (noun)
the act of bending backward (of the body or a body part)	act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased
	an angular or rounded shape made by folding
	the state of being flexed (as of a joint)