bend vs pleat

bend and pleat both are nouns.

Word	Noun	Adjective	Verb	Adverb
bend	Yes	No	Yes	No
pleat	Yes	No	Yes	No

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

bend: an angular or rounded shape made by folding
pleat: any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape

Other hyponyms of bend include plait, kink, twirl, twist, pucker, ruck, accordion fold, concertina fold, z-fold, zig-zag fold.

bend (noun)	pleat (noun)
curved segment (of a road or river or railroad track etc.)	any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape
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)	pleat (verb)
cause (an object) to assume a crooked or angular form	pleat or gather into a ruffle
bend a joint	fold into pleats
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