vena renalis vs renal vein

vena renalis and renal vein both are nouns.

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

As nouns, vena renalis and renal vein are synonyms defined as:

vena renalis and renal vein: veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra

vena renalis (noun)	renal vein (noun)
veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra	veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra