fold vs kink

fold and kink both are nouns.

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

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

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

fold (noun)	kink (noun)
the act of folding	a difficulty or flaw in a plan or operation
a pen for sheep	an eccentric idea
a folded part (as in skin or muscle)	a person with unusual sexual tastes
a group of people who adhere to a common faith and habitually attend a given church	a sharp bend in a line produced when a line having a loop is pulled tight
a group of sheep or goats	a painful muscle spasm especially in the neck or back (`rick' and `wrick' are British)
a geological process that causes a bend in a stratum of rock
an angular or rounded shape made by folding

fold (verb)	kink (verb)
incorporate a food ingredient into a mixture by repeatedly turning it over without stirring or beating	form a curl, curve, or kink
become folded or folded up	curl tightly
bend or lay so that one part covers the other
confine in a fold, like sheep
cease to operate or cause to cease operating