buckle vs crumple

buckle is a noun but crumple is not a noun.

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

As verbs, buckle and crumple are synonyms defined as:

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

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