vena jugularis vs vena

vena jugularis and vena both are nouns.

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

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

vena jugularis: veins in the neck that return blood from the head
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena jugularis (noun)	vena (noun)
veins in the neck that return blood from the head	a blood vessel that carries blood from the capillaries toward the heart