crinkle vs ruck up

crinkle is a noun but ruck up is not a noun.

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

As verbs, ruck up is a hyponym of crinkle; that is, ruck up 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 up: become wrinkled or drawn together

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

crinkle (noun)	ruck up (noun)
a slight depression or fold in the smoothness of a surface

crinkle (verb)	ruck up (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