concertina fold vs plication

concertina fold and plication both are nouns.

Word	Noun	Adjective	Verb	Adverb
concertina fold	Yes	No	No	No
plication	Yes	No	No	No

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

concertina fold: a continuous parallel folding in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds.
plication: an angular or rounded shape made by folding

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

concertina fold (noun)	plication (noun)
a continuous parallel folding in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds.	the act of folding in parallel folds
	an angular or rounded shape made by folding