ileocolic vein vs vena

ileocolic vein and vena both are nouns.

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

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

ileocolic vein: a vein that drains the end of the ileum and the appendix and the cecum and the lower part of the ascending colon
vena: a blood vessel that carries blood from the capillaries toward the heart

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

ileocolic vein (noun)	vena (noun)
a vein that drains the end of the ileum and the appendix and the cecum and the lower part of the ascending colon	a blood vessel that carries blood from the capillaries toward the heart