scalenus vs musculus scalenus

scalenus and musculus scalenus both are nouns.

Word	Noun	Adjective	Verb	Adverb
scalenus	Yes	No	No	No
musculus scalenus	Yes	No	No	No

As nouns, scalenus and musculus scalenus are synonyms defined as:

scalenus and musculus scalenus: any of four pairs of muscles extending from the cervical vertebrae to the second rib; involved in moving the neck and in breathing

Other synonyms of scalenus include scalene muscle.

scalenus (noun)	musculus scalenus (noun)
any of four pairs of muscles extending from the cervical vertebrae to the second rib; involved in moving the neck and in breathing	any of four pairs of muscles extending from the cervical vertebrae to the second rib; involved in moving the neck and in breathing