vena subclavia vs vena

vena subclavia and vena both are nouns.

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

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

vena subclavia: a continuation of the axillary vein; joins the internal jugular to form the brachiocephalic vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena subclavia (noun)	vena (noun)
a continuation of the axillary vein; joins the internal jugular to form the brachiocephalic vein	a blood vessel that carries blood from the capillaries toward the heart