muscle fiber vs muscle cell

muscle fiber and muscle cell both are nouns.

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

As nouns, muscle fiber and muscle cell are synonyms defined as:

muscle fiber and muscle cell: an elongated contractile cell that forms the muscles of the body

Other synonyms of muscle fiber include muscle fibre.

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