WordNet records no synonym and no antonym for donatism. 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 schismatic Christian religion in northern Africa from the 4th to the 7th century; held that only those who led a blameless life belonged in the church or could administer the sacraments
Synonyms, antonyms and the broader and narrower relations for donatism come from Princeton University’s WordNet. Full sources and licences.