angular vein vs vena

angular vein and vena both are nouns.

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

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

angular vein: a short vein formed by the supraorbital vein and the supratrochlear vein and continuing as the facial vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

angular vein (noun)	vena (noun)
a short vein formed by the supraorbital vein and the supratrochlear vein and continuing as the facial vein	a blood vessel that carries blood from the capillaries toward the heart