kennedy has 7 distinct synonyms spread across 2 of its 2 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.
35th President of the United States; established the Peace Corps; assassinated in Dallas (1917-1963)
a large airport on Long Island to the east of New York City
Synonyms, antonyms and the broader and narrower relations for kennedy come from Princeton University’s WordNet. Full sources and licences.