vena pericardiaca vs pericardial vein

vena pericardiaca and pericardial vein both are nouns.

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

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

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

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