cortex vs paleocortex

cortex and paleocortex both are nouns.

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

As nouns, paleocortex is a hyponym of cortex; that is, paleocortex 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
paleocortex: the olfactory cortex of the cerebrum

Other hyponyms of cortex include neocortex, neopallium, archipallium.

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