venae centrales hepatis vs vena

venae centrales hepatis and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
venae centrales hepatis	Yes	No	No	No
vena	Yes	No	No	No

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

venae centrales hepatis: terminal branches of the hepatic veins that lie in the hepatic lobules and receive blood from the liver sinusoids
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of venae centrales hepatis include vein, venous blood vessel.

venae centrales hepatis (noun)	vena (noun)
terminal branches of the hepatic veins that lie in the hepatic lobules and receive blood from the liver sinusoids	a blood vessel that carries blood from the capillaries toward the heart