zig-zag fold vs plication

zig-zag fold and plication both are nouns.

Word	Noun	Adjective	Verb	Adverb
zig-zag fold	Yes	No	No	No
plication	Yes	No	No	No

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

zig-zag 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 zig-zag fold include bend, crease, crimp, flexure, fold.

zig-zag 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