cerebellar vein vs vena

cerebellar vein and vena both are nouns.

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

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

cerebellar vein: the veins draining the cerebellum
vena: a blood vessel that carries blood from the capillaries toward the heart

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

cerebellar vein (noun)	vena (noun)
the veins draining the cerebellum	a blood vessel that carries blood from the capillaries toward the heart