displacement has 5 distinct synonyms spread across 5 of its 7 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.
act of taking the place of another especially using underhanded tactics
(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound
(psychiatry) a defense mechanism that transfers affect or reaction from the original object to some more acceptable one
act of removing from office or employment
Synonyms, antonyms and the broader and narrower relations for displacement come from Princeton University’s WordNet. Full sources and licences.