vena gastrica vs vena

vena gastrica and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena gastrica	Yes	No	No	No
vena	Yes	No	No	No

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

vena gastrica: one of several veins draining the stomach walls
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena gastrica include vein, venous blood vessel.

vena gastrica (noun)	vena (noun)
one of several veins draining the stomach walls	a blood vessel that carries blood from the capillaries toward the heart