pallium has 4 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
Synonyms, antonyms and the broader and narrower relations for pallium come from Princeton University’s WordNet. Full sources and licences.
(Roman Catholic Church) vestment consisting of a band encircling the shoulders with two lappets hanging in front and back
cloak or mantle worn by men in ancient Rome