accessory cephalic vein vs vena cephalica accessoria

accessory cephalic vein and vena cephalica accessoria both are nouns.

Word	Noun	Adjective	Verb	Adverb
accessory cephalic vein	Yes	No	No	No
vena cephalica accessoria	Yes	No	No	No

As nouns, accessory cephalic vein and vena cephalica accessoria are synonyms defined as:

accessory cephalic vein and vena cephalica accessoria: a vein that passes along the radial edge of the forearm and joins the cephalic vein near the elbow

accessory cephalic vein (noun)	vena cephalica accessoria (noun)
a vein that passes along the radial edge of the forearm and joins the cephalic vein near the elbow	a vein that passes along the radial edge of the forearm and joins the cephalic vein near the elbow