inflexible vs inflexibility

inflexible is not a noun while inflexibility is a noun.

Word	Noun	Adjective	Verb	Adverb
inflexible	No	Yes	No	No
inflexibility	Yes	No	No	No

inflexible (noun)	inflexibility (noun)
	the quality of being rigid and rigorously severe
	a lack of physical flexibility

inflexible (adjective)	inflexibility (adjective)
resistant to being bent
incapable of change
not making concessions
incapable of adapting or changing to meet circumstances