flexible vs flexibility

flexible is not a noun while flexibility is a noun.

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

flexible (noun)	flexibility (noun)
	the quality of being adaptable or variable
	the property of being flexible; easily bent or shaped
	the trait of being easily persuaded

flexible (adjective)	flexibility (adjective)
able to flex; able to bend easily
capable of being changed
making or willing to make concessions
able to adjust readily to different conditions
bending and snapping back readily without breaking