posterior facial vein vs retromandibular vein

posterior facial vein and retromandibular vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
posterior facial vein	Yes	No	No	No
retromandibular vein	Yes	No	No	No

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

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

Other synonyms of posterior facial vein include vena retromandibularis.

posterior facial vein (noun)	retromandibular 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