vena cephalica accessoria vs accessory cephalic vein

vena cephalica accessoria and accessory cephalic vein both are nouns.

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

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

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

vena cephalica accessoria (noun)	accessory cephalic vein (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