internal auditory vein vs labyrinthine vein

internal auditory vein and labyrinthine vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
internal auditory vein	Yes	No	No	No
labyrinthine vein	Yes	No	No	No

As nouns, internal auditory vein and labyrinthine vein are synonyms defined as:

internal auditory vein and labyrinthine vein: veins that drain the inner ear

internal auditory vein (noun)	labyrinthine vein (noun)
veins that drain the inner ear	veins that drain the inner ear