crumpled vs bent

crumpled is not a noun while bent is a noun.

Word	Noun	Adjective	Verb	Adverb
crumpled	No	Yes	No	No
bent	Yes	Yes	No	No

As adjectives, crumpled and bent are synonyms defined as:

Other synonyms of crumpled include dented.

crumpled (noun)	bent (noun)
	a special way of doing something
	a relatively permanent inclination to react in a particular way
	an area of grassland unbounded by fences or hedges
	grass for pastures and lawns especially bowling and putting greens

crumpled (adjective)	bent (adjective)
of metal e.g.	of metal e.g.
	fixed in your purpose
	used of the back and knees; stooped