fibular vein vs vena

fibular vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
fibular vein	Yes	No	No	No
vena	Yes	No	No	No

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

fibular vein: accompany the peroneal arteries; arising in the heel and running up the back of the leg to join the posterior tibial veins of the popliteal vein
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of fibular vein include vein, venous blood vessel.

fibular vein (noun)	vena (noun)
accompany the peroneal arteries; arising in the heel and running up the back of the leg to join the posterior tibial veins of the popliteal vein	a blood vessel that carries blood from the capillaries toward the heart