vortex vein vs vena

vortex vein and vena both are nouns.

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

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

vortex vein: a vein formed by branches from the back surface of the eye and the ciliary body; empties into the ophthalmic veins
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vortex vein (noun)	vena (noun)
a vein formed by branches from the back surface of the eye and the ciliary body; empties into the ophthalmic veins	a blood vessel that carries blood from the capillaries toward the heart