cortex vs neural structure

cortex and neural structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
cortex	Yes	No	No	No
neural structure	Yes	No	No	No

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

cortex: the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
neural structure: a structure that is part of the nervous system

cortex (noun)	neural structure (noun)
the tissue forming the outer layer of an organ or structure in plant or animal	a structure that is part of the nervous system
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
the tissue that surrounds the lens nucleus