concertina fold vs accordion fold

concertina fold and accordion fold both are nouns.

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

As nouns, concertina fold and accordion fold are synonyms defined as:

concertina fold and accordion 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 z-fold, zig-zag fold.

concertina fold (noun)	accordion 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.