vena axillaris vs vena

vena axillaris and vena both are nouns.

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

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

vena axillaris: 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 vena axillaris include vein, venous blood vessel.

vena axillaris (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