obturator vein vs vena

obturator vein and vena both are nouns.

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

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

obturator vein: a vein formed by the union of tributaries that drain the hip joints and thigh muscles; empties into the internal iliac vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

obturator vein (noun)	vena (noun)
a vein formed by the union of tributaries that drain the hip joints and thigh muscles; empties into the internal iliac vein	a blood vessel that carries blood from the capillaries toward the heart