z-fold vs zig-zag fold

z-fold and zig-zag fold both are nouns.

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

As nouns, z-fold and zig-zag fold are synonyms defined as:

z-fold and 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.

Other synonyms of z-fold include accordion fold, concertina fold.

z-fold (noun)	zig-zag fold (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.	a continuous parallel folding in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds.