spoliation has 5 distinct synonyms spread across 1 of its 2 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.
(law) the intentional destruction of a document or an alteration of it that destroys its value as evidence
the act of stripping and taking by force
Synonyms, antonyms and the broader and narrower relations for spoliation come from Princeton University’s WordNet. Full sources and licences.