bean has 7 distinct synonyms spread across 3 of its 5 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.
any of various edible seeds of plants of the family Leguminosae used for food
any of various seeds or fruits that are beans or resemble beans
any of various leguminous plants grown for their edible seeds and pods
hit on the head, especially with a pitched baseball
Synonyms, antonyms and the broader and narrower relations for bean come from Princeton University’s WordNet. Full sources and licences.