tunica vs membrane

tunica and membrane both are nouns.

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

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

tunica: an enveloping or covering membrane or layer of body tissue
membrane: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of tunica include tissue layer.

tunica (noun)	membrane (noun)
an enveloping or covering membrane or layer of body tissue	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