vena arcuata renis vs arcuate vein of the kidney

vena arcuata renis and arcuate vein of the kidney both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena arcuata renis	Yes	No	No	No
arcuate vein of the kidney	Yes	No	No	No

As nouns, vena arcuata renis and arcuate vein of the kidney are synonyms defined as:

vena arcuata renis and arcuate vein of the kidney: veins that receive blood from interlobular veins of kidney and rectal venules

vena arcuata renis (noun)	arcuate vein of the kidney (noun)
veins that receive blood from interlobular veins of kidney and rectal venules	veins that receive blood from interlobular veins of kidney and rectal venules