eardrum vs tissue layer

eardrum and tissue layer both are nouns.

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

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

eardrum: the membrane in the ear that vibrates to sound
tissue layer: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of eardrum include membrane.

eardrum (noun)	tissue layer (noun)
the membrane in the ear that vibrates to sound	a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants