ruckle vs rumple

ruckle and rumple both are verbs.

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

As verbs, rumple is a hyponym of ruckle; that is, rumple 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
rumple: to gather something into small wrinkles or folds

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

ruckle (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
make a hoarse, rattling sound	disturb the smoothness of
	to gather something into small wrinkles or folds