vena brachialis vs vena

vena brachialis and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena brachialis	Yes	No	No	No
vena	Yes	No	No	No

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

vena brachialis: two veins in either arm that accompany the brachial artery and empty into the axillary vein
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena brachialis include vein, venous blood vessel.

vena brachialis (noun)	vena (noun)
two veins in either arm that accompany the brachial artery and empty into the axillary vein	a blood vessel that carries blood from the capillaries toward the heart