cerebral cortex vs occipital cortex

cerebral cortex and occipital cortex both are nouns.

Word	Noun	Adjective	Verb	Adverb
cerebral cortex	Yes	No	No	No
occipital cortex	Yes	No	No	No

cerebral cortex (noun)	occipital cortex (noun)
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum	that part of the cerebral cortex in either hemisphere of the brain lying in the back of the head