endosteum vs tissue layer

endosteum and tissue layer both are nouns.

Word	Noun	Adjective	Verb	Adverb
endosteum	Yes	No	No	No
tissue layer	Yes	No	No	No

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

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

Other hypernyms of endosteum include membrane.

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