maxillary vein vs vena maxillaris

maxillary vein and vena maxillaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
maxillary vein	Yes	No	No	No
vena maxillaris	Yes	No	No	No

As nouns, maxillary vein and vena maxillaris are synonyms defined as:

maxillary vein and vena maxillaris: posterior continuation of the pterygoid plexus; joins the superficial temporal vein to form the retromandibular vein

maxillary vein (noun)	vena maxillaris (noun)
posterior continuation of the pterygoid plexus; joins the superficial temporal vein to form the retromandibular vein	posterior continuation of the pterygoid plexus; joins the superficial temporal vein to form the retromandibular vein