reparation has 7 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.
compensation (given or received) for an insult or injury
“an act for which there is no reparation”
(usually plural) compensation exacted from a defeated nation by the victors
“Germany was unable to pay the reparations demanded after World War I”
Synonyms, antonyms and the broader and narrower relations for reparation come from Princeton University’s WordNet. Full sources and licences.
the act of putting something in working order again