elastic vs flexible

elastic is a noun but flexible is not a noun.

Word	Noun	Adjective	Verb	Adverb
elastic	Yes	Yes	No	No
flexible	No	Yes	No	No

As adjectives, elastic and flexible are synonyms defined as:

Other synonyms of elastic include pliable, pliant.

elastic (noun)	flexible (noun)
a fabric made of yarns containing an elastic material
a narrow band of elastic rubber used to hold things (such as papers) together

elastic (adjective)	flexible (adjective)
capable of resuming original shape after stretching or compression; springy	able to flex; able to bend easily
able to adjust readily to different conditions	capable of being changed
	making or willing to make concessions
	able to adjust readily to different conditions
	bending and snapping back readily without breaking