hudson has 4 distinct synonyms spread across 3 of its 3 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.
a New York river; flows southward into New York Bay; explored by Henry Hudson early in the 17th century
Synonyms, antonyms and the broader and narrower relations for hudson come from Princeton University’s WordNet. Full sources and licences.
English navigator who discovered the Hudson River; in 1610 he attempted to winter in Hudson Bay but his crew mutinied and set him adrift to die (1565-1611)