trapezius vs trapezius muscle

trapezius and trapezius muscle both are nouns.

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

As nouns, trapezius and trapezius muscle are synonyms defined as:

trapezius and trapezius muscle: either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms

Other synonyms of trapezius include cowl muscle, musculus trapezius.

trapezius (noun)	trapezius muscle (noun)
either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms	either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms