tissue layer vs animal tissue

tissue layer and animal tissue both are nouns.

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

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

tissue layer: a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
animal tissue: the tissue in the bodies of animals

tissue layer (noun)	animal tissue (noun)
a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants	the tissue in the bodies of animals