scrunch vs rumple

scrunch is a noun but rumple is not a noun.

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

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

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

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

scrunch (noun)	rumple (noun)
a crunching noise

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