cockle vs rumple

cockle is a noun but rumple is not a noun.

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

As verbs, cockle and rumple are synonyms defined as:

Other synonyms of cockle include crumple, knit, pucker.

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

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