concertina fold vs z-fold

concertina fold and z-fold both are nouns.

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

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

concertina fold and 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 synonyms of concertina fold include accordion fold, zig-zag fold.

concertina fold (noun)	z-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.