uterine vein vs vena

uterine vein and vena both are nouns.

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

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

uterine vein: one of two veins on each side that arise from the uterine plexus and empty into the internal iliac vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

uterine vein (noun)	vena (noun)
one of two veins on each side that arise from the uterine plexus and empty into the internal iliac vein	a blood vessel that carries blood from the capillaries toward the heart