visceral pericardium vs epicardium

visceral pericardium and epicardium both are nouns.

Word	Noun	Adjective	Verb	Adverb
visceral pericardium	Yes	No	No	No
epicardium	Yes	No	No	No

As nouns, visceral pericardium and epicardium are synonyms defined as:

visceral pericardium and epicardium: the innermost of the two layers of the pericardium

visceral pericardium (noun)	epicardium (noun)
the innermost of the two layers of the pericardium	the innermost of the two layers of the pericardium