crinkle vs ruck

crinkle and ruck both are nouns.

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

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

crinkle: make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic
ruck: become wrinkled or drawn together

Other hyponyms of crinkle include cockle, crumple, knit, pucker, rumple, pucker, ruck up.

crinkle (noun)	ruck (noun)
a slight depression or fold in the smoothness of a surface	a crowd especially of ordinary or undistinguished persons or things
	an irregular fold in an otherwise even surface (as in cloth)

crinkle (verb)	ruck (verb)
become wrinkled or crumpled or creased	become wrinkled or drawn together
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic