endosteum vs membrane

endosteum and membrane both are nouns.

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

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

endosteum: vascular membrane that lines the inner surface of long bones
membrane: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of endosteum include tissue layer.

endosteum (noun)	membrane (noun)
vascular membrane that lines the inner surface of long bones	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