vena cystica vs vena

vena cystica and vena both are nouns.

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

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

vena cystica: vein that drains the gallbladder
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena cystica (noun)	vena (noun)
vein that drains the gallbladder	a blood vessel that carries blood from the capillaries toward the heart