pericardium vs serosa

pericardium and serosa both are nouns.

Word	Noun	Adjective	Verb	Adverb
pericardium	Yes	No	No	No
serosa	Yes	No	No	No

As nouns, serosa is a hypernym of pericardium; that is, serosa is a word with a broader meaning than pericardium:

pericardium: a serous membrane with two layers that surrounds the heart
serosa: a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid

Other hypernyms of pericardium include serous membrane.

pericardium (noun)	serosa (noun)
a serous membrane with two layers that surrounds the heart	a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid