pancreatic vein vs vena

pancreatic vein and vena both are nouns.

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

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

pancreatic vein: veins draining the pancreas and emptying into the superior mesenteric and splenic veins
vena: a blood vessel that carries blood from the capillaries toward the heart

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

pancreatic vein (noun)	vena (noun)
veins draining the pancreas and emptying into the superior mesenteric and splenic veins	a blood vessel that carries blood from the capillaries toward the heart