scrotal vein vs vena

scrotal vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
scrotal vein	Yes	No	No	No
vena	Yes	No	No	No

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

scrotal vein: veins passing from the scrotum to the pudendal veins
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of scrotal vein include vein, venous blood vessel.

scrotal vein (noun)	vena (noun)
veins passing from the scrotum to the pudendal veins	a blood vessel that carries blood from the capillaries toward the heart