fold vs ruck

fold and ruck both are nouns.

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

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

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

fold (noun)	ruck (noun)
the act of folding	a crowd especially of ordinary or undistinguished persons or things
a pen for sheep	an irregular fold in an otherwise even surface (as in cloth)
a folded part (as in skin or muscle)
a group of people who adhere to a common faith and habitually attend a given church
a group of sheep or goats
a geological process that causes a bend in a stratum of rock
an angular or rounded shape made by folding

fold (verb)	ruck (verb)
incorporate a food ingredient into a mixture by repeatedly turning it over without stirring or beating	become wrinkled or drawn together
become folded or folded up
bend or lay so that one part covers the other
confine in a fold, like sheep
cease to operate or cause to cease operating