gastroomental vein vs vena

gastroomental vein and vena both are nouns.

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

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

gastroomental 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 gastroomental vein include vein, venous blood vessel.

gastroomental 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