vena renalis vs vena

vena renalis and vena both are nouns.

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

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

vena renalis: veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena renalis (noun)	vena (noun)
veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra	a blood vessel that carries blood from the capillaries toward the heart