ruckle vs crumple

ruckle and crumple both are verbs.

Word	Noun	Adjective	Verb	Adverb
ruckle	No	No	Yes	No
crumple	No	No	Yes	No

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

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

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

ruckle (verb)	crumple (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
make a hoarse, rattling sound	to gather something into small wrinkles or folds
	fold or collapse
	fall apart