serous membrane vs tissue layer

serous membrane and tissue layer both are nouns.

Word	Noun	Adjective	Verb	Adverb
serous membrane	Yes	No	No	No
tissue layer	Yes	No	No	No

As nouns, tissue layer is a hypernym of serous membrane; that is, tissue layer is a word with a broader meaning than serous membrane:

serous membrane: a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid
tissue layer: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of serous membrane include membrane.

serous membrane (noun)	tissue layer (noun)
a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid	a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants