bucolic has 7 distinct synonyms spread across 4 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.
a short poem descriptive of rural or pastoral life
Synonyms, antonyms and the broader and narrower relations for bucolic come from Princeton University’s WordNet. Full sources and licences.
relating to shepherds or herdsmen or devoted to raising sheep or cattle
“pastoral seminomadic people”