gastroepiploic vein vs vena

gastroepiploic vein and vena both are nouns.

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

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

gastroepiploic vein: one of two veins serving the great curvature of the stomach
vena: a blood vessel that carries blood from the capillaries toward the heart

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

gastroepiploic vein (noun)	vena (noun)
one of two veins serving the great curvature of the stomach	a blood vessel that carries blood from the capillaries toward the heart