vena bulbi vestibuli vs vena

vena bulbi vestibuli and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena bulbi vestibuli	Yes	No	No	No
vena	Yes	No	No	No

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

vena bulbi vestibuli: vein of the vestibular bulb
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena bulbi vestibuli include vein, venous blood vessel.

vena bulbi vestibuli (noun)	vena (noun)
vein of the vestibular bulb	a blood vessel that carries blood from the capillaries toward the heart