edward iv 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.
King of England from 1461 to 1470 and from 1471 to 1483; was dethroned in 1470 but regained the throne in 1471 by his victory at the battle of Tewkesbury (1442-1483)
Synonyms, antonyms and the broader and narrower relations for edward iv come from Princeton University’s WordNet. Full sources and licences.