plication vs kink

plication and kink both are nouns.

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

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

plication: 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 plication include plait, pleat, twirl, twist, pucker, ruck, accordion fold, concertina fold, z-fold, zig-zag fold.

plication (noun)	kink (noun)
the act of folding in parallel folds	a difficulty or flaw in a plan or operation
an angular or rounded shape made by folding	an eccentric idea
	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)

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