muscular vs muscularity

muscular is not a noun while muscularity is a noun.

Word	Noun	Adjective	Verb	Adverb
muscular	No	Yes	No	No
muscularity	Yes	No	No	No

muscular (noun)	muscularity (noun)
	possessing muscular strength
	an imaginative lively style (especially style of writing)
	the physiological state of having or consisting of muscle

muscular (adjective)	muscularity (adjective)
having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer
of or relating to or consisting of muscle
having or suggesting great physical power or force
(of a person) possessing physical strength and weight; rugged and powerful