apostolical has 3 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.
proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles
“papal dispensation”
of or relating to or deriving from the Apostles or their teachings
Synonyms, antonyms and the broader and narrower relations for apostolical come from Princeton University’s WordNet. Full sources and licences.