internal auditory vein vs vena

internal auditory vein and vena both are nouns.

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

As nouns, vena is a hypernym of internal auditory vein; that is, vena is a word with a broader meaning than internal auditory vein:

internal auditory vein: veins that drain the inner ear
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of internal auditory vein include vein, venous blood vessel.

internal auditory vein (noun)	vena (noun)
veins that drain the inner ear	a blood vessel that carries blood from the capillaries toward the heart