fetal membrane vs membrane

fetal membrane and membrane both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetal membrane	Yes	No	No	No
membrane	Yes	No	No	No

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

fetal membrane: any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
membrane: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of fetal membrane include tissue layer.

fetal membrane (noun)	membrane (noun)
any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus	a thin pliable sheet of material
	a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants