layer vs body structure

layer and body structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
layer	Yes	No	Yes	No
body structure	Yes	No	No	No

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

layer: thin structure composed of a single thickness of cells
body structure: a particular complex anatomical part of a living thing and its construction and arrangement

Other hypernyms of layer include anatomical structure, bodily structure, complex body part, structure.

layer (noun)	body structure (noun)
thin structure composed of a single thickness of cells	a particular complex anatomical part of a living thing and its construction and arrangement
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

layer (verb)	body structure (verb)
make or form a layer