sinew vs muscle

sinew and muscle both are nouns.

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

As nouns, sinew and muscle are synonyms defined as:

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

sinew (noun)	muscle (noun)
possessing muscular strength	possessing muscular strength
a cord or band of inelastic tissue connecting a muscle with its bony attachment	authority or power or force (especially when used in a coercive way)
	one of the contractile organs of the body
	animal tissue consisting predominantly of contractile cells
	a bully employed as a thug or bodyguard

sinew (verb)	muscle (verb)
	make one's way by force