sino-japanese war has 1 distinct synonym spread across 1 of its 1 sense. 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.
a war between China and Japan (1894 and 1895) over the control of the Korean Peninsula; China was overwhelmingly defeated at Port Arthur
Synonyms, antonyms and the broader and narrower relations for sino-japanese war come from Princeton University’s WordNet. Full sources and licences.