ethmoidal vein vs vena

ethmoidal vein and vena both are nouns.

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

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

ethmoidal vein: veins that drain the ethmoidal sinuses and empty into the superior ophthalmic vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

ethmoidal vein (noun)	vena (noun)
veins that drain the ethmoidal sinuses and empty into the superior ophthalmic vein	a blood vessel that carries blood from the capillaries toward the heart