rumple vs cockle

rumple is not a noun while cockle is a noun.

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

As verbs, rumple and cockle are synonyms defined as:

Other synonyms of rumple include crumple, knit, pucker.

rumple (noun)	cockle (noun)
	common edible, burrowing European bivalve mollusk that has a strong, rounded shell with radiating ribs
	common edible European bivalve

rumple (verb)	cockle (verb)
become wrinkled or crumpled or creased	to gather something into small wrinkles or folds
disturb the smoothness of	stir up (water) so as to form ripples
to gather something into small wrinkles or folds