vena occipitalis vs vena

vena occipitalis and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena occipitalis	Yes	No	No	No
vena	Yes	No	No	No

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

vena occipitalis: a vein that drains the occipital region
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena occipitalis include vein, venous blood vessel.

vena occipitalis (noun)	vena (noun)
a vein that drains the occipital region	a blood vessel that carries blood from the capillaries toward the heart