posterior facial vein vs vena retromandibularis

posterior facial vein and vena retromandibularis both are nouns.

Word	Noun	Adjective	Verb	Adverb
posterior facial vein	Yes	No	No	No
vena retromandibularis	Yes	No	No	No

As nouns, posterior facial vein and vena retromandibularis are synonyms defined as:

posterior facial vein and vena retromandibularis: posterior branch of the facial vein; formed by temporal veins in front of the ear

Other synonyms of posterior facial vein include retromandibular vein.

posterior facial vein (noun)	vena retromandibularis (noun)
posterior branch of the facial vein; formed by temporal veins in front of the ear	posterior branch of the facial vein; formed by temporal veins in front of the ear