vena ulnaris vs vena

vena ulnaris and vena both are nouns.

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

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

vena ulnaris: any of several veins of the forearm
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena ulnaris (noun)	vena (noun)
any of several veins of the forearm	a blood vessel that carries blood from the capillaries toward the heart