axillary vein vs vena axillaris

axillary vein and vena axillaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
axillary vein	Yes	No	No	No
vena axillaris	Yes	No	No	No

As nouns, axillary vein and vena axillaris are synonyms defined as:

axillary vein and vena axillaris: a continuation of the basilic vein and brachial vein that becomes the subclavian vein

axillary vein (noun)	vena axillaris (noun)
a continuation of the basilic vein and brachial vein that becomes the subclavian vein	a continuation of the basilic vein and brachial vein that becomes the subclavian vein