vena mesenterica vs vena

vena mesenterica and vena both are nouns.

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

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

vena mesenterica: a tributary of the portal vein passing from the intestine between the two layers of mesentery
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena mesenterica (noun)	vena (noun)
a tributary of the portal vein passing from the intestine between the two layers of mesentery	a blood vessel that carries blood from the capillaries toward the heart