disguise has 2 distinct synonyms spread across 3 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.
an outward semblance that misrepresents the true nature of something
“the theatrical notion of disguise is always associated with catastrophe in his stories”
any attire that modifies the appearance in order to conceal the wearer's identity
the act of concealing the identity of something by modifying its appearance
“he is a master of disguise”
Synonyms, antonyms and the broader and narrower relations for disguise come from Princeton University’s WordNet. Full sources and licences.