temporal vein vs vena

temporal vein and vena both are nouns.

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

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

temporal vein: any of several veins draining the temporal region
vena: a blood vessel that carries blood from the capillaries toward the heart

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

temporal vein (noun)	vena (noun)
any of several veins draining the temporal region	a blood vessel that carries blood from the capillaries toward the heart