neocortex vs cortex

neocortex and cortex both are nouns.

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

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

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

Other hypernyms of neocortex include cerebral cortex, cerebral mantle, pallium.

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