neocortex vs cerebral mantle

neocortex and cerebral mantle both are nouns.

Word	Noun	Adjective	Verb	Adverb
neocortex	Yes	No	No	No
cerebral mantle	Yes	No	No	No

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

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

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

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