musculus trapezius vs trapezius muscle

musculus trapezius and trapezius muscle both are nouns.

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

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

musculus 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 musculus trapezius include cowl muscle, trapezius.

musculus 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