rumple vs scrunch up

rumple and scrunch up both are verbs.

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

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

rumple: to gather something into small wrinkles or folds
scrunch up: make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic

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

rumple (verb)	scrunch up (verb)
become wrinkled or crumpled or creased	make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic
disturb the smoothness of	sit on one's heels
to gather something into small wrinkles or folds