cristoforo colombo has 3 distinct synonyms 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.
Italian navigator who discovered the New World in the service of Spain while looking for a route to China (1451-1506)
Synonyms, antonyms and the broader and narrower relations for cristoforo colombo come from Princeton University’s WordNet. Full sources and licences.