vena cephalica vs vena

vena cephalica and vena both are nouns.

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

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

vena cephalica: a large vein of the arm that empties into the axillary vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena cephalica (noun)	vena (noun)
a large vein of the arm that empties into the axillary vein	a blood vessel that carries blood from the capillaries toward the heart