peroneal vein vs vena peroneus

peroneal vein and vena peroneus both are nouns.

Word	Noun	Adjective	Verb	Adverb
peroneal vein	Yes	No	No	No
vena peroneus	Yes	No	No	No

As nouns, peroneal vein and vena peroneus are synonyms defined as:

peroneal vein and vena peroneus: 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

Other synonyms of peroneal vein include fibular vein.

peroneal vein (noun)	vena peroneus (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	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