sinew vs muscularity

sinew and muscularity both are nouns.

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

As nouns, sinew and muscularity are synonyms defined as:

Other synonyms of sinew include brawn, brawniness, heftiness, muscle.

sinew (noun)	muscularity (noun)
possessing muscular strength	possessing muscular strength
a cord or band of inelastic tissue connecting a muscle with its bony attachment	an imaginative lively style (especially style of writing)
	the physiological state of having or consisting of muscle