vena retromandibularis vs posterior facial vein

vena retromandibularis and posterior facial vein both are nouns.

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

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

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

Other synonyms of vena retromandibularis include retromandibular vein.

vena retromandibularis (noun)	posterior facial vein (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