bend vs accordion fold

bend and accordion fold both are nouns.

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

As nouns, accordion fold is a hyponym of bend; that is, accordion fold is a word with a more specific, narrower meaning than bend:

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

bend (noun)	accordion fold (noun)
curved segment (of a road or river or railroad track etc.)	a continuous parallel folding in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds.
diagonal line traversing a shield from the upper right corner to the lower left
movement that causes the formation of a curve
an angular or rounded shape made by folding
a circular segment of a curve

bend (verb)	accordion fold (verb)
cause (an object) to assume a crooked or angular form
bend a joint
form a curve
change direction
turn from a straight course, fixed direction, or line of interest
bend one's back forward from the waist on down