crease vs zig-zag fold

crease and zig-zag fold both are nouns.

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

As nouns, zig-zag fold is a hyponym of crease; that is, zig-zag fold is a word with a more specific, narrower meaning than crease:

crease: an angular or rounded shape made by folding
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 hyponyms of crease include plait, pleat, kink, twirl, twist, pucker, ruck, accordion fold, concertina fold, z-fold.

crease (noun)	zig-zag fold (noun)
a Malayan dagger with a wavy blade	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 slight depression or fold in the smoothness of a surface
an angular or rounded shape made by folding

crease (verb)	zig-zag fold (verb)
become wrinkled or crumpled or creased
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic
make wrinkled or creased
scrape gently