scalene muscle vs scalenus

scalene muscle and scalenus both are nouns.

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

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

scalene muscle and 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 scalene muscle include musculus scalenus.

scalene muscle (noun)	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