digital vein vs vena

digital vein and vena both are nouns.

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

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

digital vein: one of the veins serving the fingers or toes
vena: a blood vessel that carries blood from the capillaries toward the heart

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

digital vein (noun)	vena (noun)
one of the veins serving the fingers or toes	a blood vessel that carries blood from the capillaries toward the heart