flexure vs pleat

flexure and pleat both are nouns.

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

As nouns, pleat is a hyponym of flexure; that is, pleat is a word with a more specific, narrower meaning than flexure:

flexure: an angular or rounded shape made by folding
pleat: any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape

Other hyponyms of flexure include plait, kink, twirl, twist, pucker, ruck, accordion fold, concertina fold, z-fold, zig-zag fold.

flexure (noun)	pleat (noun)
act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased	any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape
an angular or rounded shape made by folding
the state of being flexed (as of a joint)

flexure (verb)	pleat (verb)
	pleat or gather into a ruffle
	fold into pleats