brachiocephalic vein vs vena brachiocephalica

brachiocephalic vein and vena brachiocephalica both are nouns.

Word	Noun	Adjective	Verb	Adverb
brachiocephalic vein	Yes	No	No	No
vena brachiocephalica	Yes	No	No	No

As nouns, brachiocephalic vein and vena brachiocephalica are synonyms defined as:

brachiocephalic vein and vena brachiocephalica: veins formed by the union of the internal jugular and subclavian veins

Other synonyms of brachiocephalic vein include innominate vein.

brachiocephalic vein (noun)	vena brachiocephalica (noun)
veins formed by the union of the internal jugular and subclavian veins	veins formed by the union of the internal jugular and subclavian veins