crumple vs buckle

crumple is not a noun while buckle is a noun.

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

As verbs, crumple and buckle are synonyms defined as:

crumple (noun)	buckle (noun)
	fastener that fastens together two ends of a belt or strap; often has loose prong
	a shape distorted by twisting or folding

crumple (verb)	buckle (verb)
become wrinkled or crumpled or creased	bend out of shape, as under pressure or from heat
to gather something into small wrinkles or folds	fasten with a buckle or buckles
fold or collapse	fold or collapse
fall apart