ruck up vs scrunch up

ruck up and scrunch up both are verbs.

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

As verbs, scrunch up is a hypernym of ruck up; that is, scrunch up is a word with a broader meaning than ruck up:

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

Other hypernyms of ruck up include crease, crinkle, crisp, ruckle, scrunch, wrinkle.

ruck up (verb)	scrunch up (verb)
become wrinkled or drawn together	make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic
	sit on one's heels