jugular vs vena

jugular and vena both are nouns.

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

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

jugular: 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 jugular include vein, venous blood vessel.

jugular (noun)	vena (noun)
a vital part that is vulnerable to attack	a blood vessel that carries blood from the capillaries toward the heart
veins in the neck that return blood from the head

jugular (adjective)	vena (adjective)
relating to or located in the region of the neck or throat