vena arcuata renis vs vena

vena arcuata renis and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena arcuata renis	Yes	No	No	No
vena	Yes	No	No	No

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

vena arcuata renis: veins that receive blood from interlobular veins of kidney and rectal venules
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena arcuata renis include vein, venous blood vessel.

vena arcuata renis (noun)	vena (noun)
veins that receive blood from interlobular veins of kidney and rectal venules	a blood vessel that carries blood from the capillaries toward the heart