scalenus vs scalene muscle

scalenus and scalene muscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
scalenus	Yes	No	No	No
scalene muscle	Yes	No	No	No

As nouns, scalenus and scalene muscle are synonyms defined as:

scalenus and scalene muscle: 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 musculus scalenus.

scalenus (noun)	scalene muscle (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