cowl muscle vs trapezius

cowl muscle and trapezius both are nouns.

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

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

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

Other synonyms of cowl muscle include musculus trapezius, trapezius muscle.

cowl muscle (noun)	trapezius (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