intercostal vein vs vena

intercostal vein and vena both are nouns.

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

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

intercostal vein: several veins draining the intercostal spaces of the rib cage
vena: a blood vessel that carries blood from the capillaries toward the heart

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

intercostal vein (noun)	vena (noun)
several veins draining the intercostal spaces of the rib cage	a blood vessel that carries blood from the capillaries toward the heart