asthenosphere vs layer

asthenosphere and layer both are nouns.

Word	Noun	Adjective	Verb	Adverb
asthenosphere	Yes	No	No	No
layer	Yes	No	Yes	No

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

asthenosphere: the lower layer of the crust
layer: a relatively thin sheetlike expanse or region lying over or under another

asthenosphere (noun)	layer (noun)
the lower layer of the crust	thin structure composed of a single thickness of cells
	a hen that lays eggs
	single thickness of usually some homogeneous substance
	an abstract place usually conceived as having depth
	a relatively thin sheetlike expanse or region lying over or under another

asthenosphere (verb)	layer (verb)
	make or form a layer