muscle cell vs muscle fiber

muscle cell and muscle fiber both are nouns.

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

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

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

Other synonyms of muscle cell include muscle fibre.

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