vena pulmonalis vs vena

vena pulmonalis and vena both are nouns.

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

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

vena pulmonalis: any of four veins that carry arterial blood from the lungs to the left atrium of the heart
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena pulmonalis (noun)	vena (noun)
any of four veins that carry arterial blood from the lungs to the left atrium of the heart	a blood vessel that carries blood from the capillaries toward the heart