umbilical vein vs vena

umbilical vein and vena both are nouns.

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

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

umbilical vein: a vein in the umbilical cord; returns nutrient blood from the placenta to the fetus
vena: a blood vessel that carries blood from the capillaries toward the heart

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

umbilical vein (noun)	vena (noun)
a vein in the umbilical cord; returns nutrient blood from the placenta to the fetus	a blood vessel that carries blood from the capillaries toward the heart