WordNet (r) 3.0 (2006):

cerebral cortex
    n 1: the layer of unmyelinated neurons (the grey matter) forming
         the cortex of the cerebrum [syn: cerebral cortex,
         cerebral mantle, pallium, cortex]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "cerebral cortex":
   afferent neuron, arachnoid, arbor vitae, archipallium,
   autonomic nervous system, axon, between brain, brain, brain stem,
   central nervous system, cerebellar hemispheres, cerebellum,
   cerebrospinal fluid, cerebrum, convolution, corpus callosum,
   corpus striatum, craniosacral nervous system, dendrite,
   diencephalon, dura mater, effector organ, efferent neuron,
   endbrain, fissure, folia, forebrain, fornix, frontal lobe,
   ganglion, glial cells, globus pallidus, gray matter, gyrus,
   hindbrain, hippocampus, hypothalamus, internuncial neuron,
   lenticular nucleus, limbic lobe, little brain, lobe, mantle,
   medulla oblongata, medullary sheath, meninges, mesencephalon,
   metencephalon, midbrain, myelencephalon, neopallium, nerve,
   nerve trunk, nervous system, neuron, occipital lobe, optic chiasm,
   pallium, parietal lobe, peripheral nervous system, pia mater,
   pineal body, pituitary body, plexus, pons, reticular system,
   rhombencephalon, sensorium, sensory area, sensory cell,
   solar plexus, spinal cord, subthalamus, synapse, telencephalon,
   temporal lobe, thalamus, thoracolumbar nervous system, ventricle,
   vermis, white matter