ciliary veins vs vena

ciliary veins and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
ciliary veins	Yes	No	No	No
vena	Yes	No	No	No

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

ciliary veins: small veins coming from the ciliary body
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of ciliary veins include vein, venous blood vessel.

ciliary veins (noun)	vena (noun)
small veins coming from the ciliary body	a blood vessel that carries blood from the capillaries toward the heart