muscle vs muscle fiber

muscle and muscle fiber both are nouns.

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

muscle (noun)	muscle fiber (noun)
possessing muscular strength	an elongated contractile cell that forms the muscles of the body
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

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