cortex vs neocortex

cortex and neocortex both are nouns.

Word	Noun	Adjective	Verb	Adverb
cortex	Yes	No	No	No
neocortex	Yes	No	No	No

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

cortex: the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
neocortex: the cortical part of the neencephalon

Other hyponyms of cortex include neopallium, archipallium, paleocortex.

cortex (noun)	neocortex (noun)
the tissue forming the outer layer of an organ or structure in plant or animal	the cortical part of the neencephalon
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
the tissue that surrounds the lens nucleus