flexure vs kink

flexure and kink both are nouns.

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

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

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

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

flexure (noun)	kink (noun)
act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased	a difficulty or flaw in a plan or operation
an angular or rounded shape made by folding	an eccentric idea
the state of being flexed (as of a joint)	a person with unusual sexual tastes
	a sharp bend in a line produced when a line having a loop is pulled tight
	a painful muscle spasm especially in the neck or back (`rick' and `wrick' are British)

flexure (verb)	kink (verb)
	form a curl, curve, or kink
	curl tightly