plication vs z-fold

plication and z-fold both are nouns.

Word	Noun	Adjective	Verb	Adverb
plication	Yes	No	No	No
z-fold	Yes	No	No	No

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

plication: an angular or rounded shape made by folding
z-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.

Other hyponyms of plication include plait, pleat, kink, twirl, twist, pucker, ruck, accordion fold, concertina fold, zig-zag fold.

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