portal vein vs hepatic portal vein

portal vein and hepatic portal vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
portal vein	Yes	No	No	No
hepatic portal vein	Yes	No	No	No

As nouns, portal vein and hepatic portal vein are synonyms defined as:

portal vein and hepatic portal vein: a short vein that carries blood into the liver

Other synonyms of portal vein include portal, vena portae.

portal vein (noun)	hepatic portal vein (noun)
a short vein that carries blood into the liver	a short vein that carries blood into the liver