baseball has 2 distinct synonyms spread across 1 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.
a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs
“he played baseball in high school”
Synonyms, antonyms and the broader and narrower relations for baseball come from Princeton University’s WordNet. Full sources and licences.
a ball used in playing baseball