bend vs ruck

bend and ruck both are nouns.

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

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

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

bend (noun)	ruck (noun)
curved segment (of a road or river or railroad track etc.)	a crowd especially of ordinary or undistinguished persons or things
diagonal line traversing a shield from the upper right corner to the lower left	an irregular fold in an otherwise even surface (as in cloth)
movement that causes the formation of a curve
an angular or rounded shape made by folding
a circular segment of a curve

bend (verb)	ruck (verb)
cause (an object) to assume a crooked or angular form	become wrinkled or drawn together
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