vena centrales retinae vs vena

vena centrales retinae and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena centrales retinae	Yes	No	No	No
vena	Yes	No	No	No

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

vena centrales retinae: vein formed by the union of the retinal veins; accompanies central arteries of the retina in the optic nerve
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena centrales retinae include vein, venous blood vessel.

vena centrales retinae (noun)	vena (noun)
vein formed by the union of the retinal veins; accompanies central arteries of the retina in the optic nerve	a blood vessel that carries blood from the capillaries toward the heart