columbus has 4 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.
the state capital of Ohio; located in the center of the state; site of Ohio State University
Italian navigator who discovered the New World in the service of Spain while looking for a route to China (1451-1506)
a town in eastern Mississippi near the border with Alabama
a city in western Georgia on the Chattahoochee River; industrial center
Synonyms, antonyms and the broader and narrower relations for columbus come from Princeton University’s WordNet. Full sources and licences.