external nasal vein vs vena

external nasal vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
external nasal vein	Yes	No	No	No
vena	Yes	No	No	No

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

external nasal vein: one of the veins that drain the external nose and empty into the angular or facial vein
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of external nasal vein include vein, venous blood vessel.

external nasal vein (noun)	vena (noun)
one of the veins that drain the external nose and empty into the angular or facial vein	a blood vessel that carries blood from the capillaries toward the heart