twirl vs plication

twirl and plication both are nouns.

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

As nouns, plication is a hypernym of twirl; that is, plication is a word with a broader meaning than twirl:

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

Other hypernyms of twirl include bend, crease, crimp, flexure, fold.

twirl (noun)	plication (noun)
the act of rotating rapidly	the act of folding in parallel folds
a sharp bend in a line produced when a line having a loop is pulled tight	an angular or rounded shape made by folding

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