labyrinthine vein vs vena

labyrinthine vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
labyrinthine vein	Yes	No	No	No
vena	Yes	No	No	No

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

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

Other hypernyms of labyrinthine vein include vein, venous blood vessel.

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