sarcolemma vs membrane

sarcolemma and membrane both are nouns.

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

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

sarcolemma: an extensible membrane enclosing the contractile substance of a muscle fiber
membrane: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of sarcolemma include tissue layer.

sarcolemma (noun)	membrane (noun)
an extensible membrane enclosing the contractile substance of a muscle fiber	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