membrane vs intima

membrane and intima both are nouns.

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

As nouns, intima is a hyponym of membrane; that is, intima is a word with a more specific, narrower meaning than membrane:

membrane: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
intima: the innermost membrane of an organ (especially the inner lining of an artery or vein or lymphatic vessel)

membrane (noun)	intima (noun)
a thin pliable sheet of material	the innermost membrane of an organ (especially the inner lining of an artery or vein or lymphatic vessel)
a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants