layer vs backing

layer and backing both are nouns.

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

As nouns, backing is a hyponym of layer; that is, backing is a word with a more specific, narrower meaning than layer:

Other hyponyms of layer include mount, blanket, course, row, cushion, interlayer, lift, overlay, ply, tier, wall.

layer (noun)	backing (noun)
thin structure composed of a single thickness of cells	the act of providing approval and support
a hen that lays eggs	something forming a back that is added for strengthening
single thickness of usually some homogeneous substance	financial resources provided to make some project possible
an abstract place usually conceived as having depth
a relatively thin sheetlike expanse or region lying over or under another

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