pucker vs flexure

pucker and flexure both are nouns.

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

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

Other hypernyms of pucker include bend, crease, crimp, fold, plication.

pucker (noun)	flexure (noun)
an irregular fold in an otherwise even surface (as in cloth)	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)

pucker (verb)	flexure (verb)
to gather something into small wrinkles or folds
draw together into folds or puckers
become wrinkled or drawn together