vena metacarpus vs vena

vena metacarpus and vena both are nouns.

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

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

vena metacarpus: dorsal and palmar veins of the hand
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena metacarpus (noun)	vena (noun)
dorsal and palmar veins of the hand	a blood vessel that carries blood from the capillaries toward the heart