cortex vs neopallium

cortex and neopallium both are nouns.

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

As nouns, neopallium is a hyponym of cortex; that is, neopallium 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
neopallium: the cortical part of the neencephalon

Other hyponyms of cortex include neocortex, archipallium, paleocortex.

cortex (noun)	neopallium (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