axillary vein vs vena

axillary vein and vena both are nouns.

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

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

axillary vein: a continuation of the basilic vein and brachial vein that becomes the subclavian vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

axillary vein (noun)	vena (noun)
a continuation of the basilic vein and brachial vein that becomes the subclavian vein	a blood vessel that carries blood from the capillaries toward the heart