ependyma vs tissue layer

ependyma and tissue layer both are nouns.

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

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

ependyma: thin epithelial membrane lining the ventricles of the brain and the spinal cord canal
tissue layer: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Other hypernyms of ependyma include membrane.

ependyma (noun)	tissue layer (noun)
thin epithelial membrane lining the ventricles of the brain and the spinal cord canal	a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants