peritoneum vs serosa

peritoneum and serosa both are nouns.

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

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

peritoneum: a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera
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 peritoneum include serous membrane.

peritoneum (noun)	serosa (noun)
a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera	a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid