pericardial vein vs vena pericardiaca

pericardial vein and vena pericardiaca both are nouns.

Word	Noun	Adjective	Verb	Adverb
pericardial vein	Yes	No	No	No
vena pericardiaca	Yes	No	No	No

As nouns, pericardial vein and vena pericardiaca are synonyms defined as:

pericardial vein and vena pericardiaca: several small veins from the pericardium

pericardial vein (noun)	vena pericardiaca (noun)
several small veins from the pericardium	several small veins from the pericardium