WordNet records no synonym and no antonym for council of trent. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 council of the Roman Catholic Church convened in Trento in three sessions between 1545 and 1563 to examine and condemn the teachings of Martin Luther and other Protestant reformers; redefined the Roman Catholic doctrine and abolished various ecclesiastical abuses and strengthened the papacy
Synonyms, antonyms and the broader and narrower relations for council of trent come from Princeton University’s WordNet. Full sources and licences.