flexure vs twirl

flexure and twirl both are nouns.

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

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

flexure: an angular or rounded shape made by folding
twirl: a sharp bend in a line produced when a line having a loop is pulled tight

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

flexure (noun)	twirl (noun)
act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased	the act of rotating rapidly
an angular or rounded shape made by folding	a sharp bend in a line produced when a line having a loop is pulled tight
the state of being flexed (as of a joint)

flexure (verb)	twirl (verb)
	turn in a twisting or spinning motion
	cause to spin