judicature 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.
an assembly (including one or more judges) to conduct judicial business
the system of law courts that administer justice and constitute the judicial branch of government
Synonyms, antonyms and the broader and narrower relations for judicature come from Princeton University’s WordNet. Full sources and licences.