Portal vein and Venous blood vessel

Portal vein noun - A short vein that carries blood into the liver.

Venous blood vessel and portal vein are semantically related. In some cases you can use "Venous blood vessel" instead a noun phrase "Portal vein".

Venous blood vessel noun - A blood vessel that carries blood from the capillaries toward the heart.

Portal vein and venous blood vessel are semantically related. Sometimes you can replace phrase "Portal vein" with "Venous blood vessel", this phrases are similar.