WordNet records no synonym and no antonym for wicca. It is the only member of each of its synsets, 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 community of followers of the Wicca religion
the polytheistic nature religion of modern witchcraft whose central deity is a mother goddess; claims origins in pre-Christian pagan religions of western Europe
Synonyms, antonyms and the broader and narrower relations for wicca come from Princeton University’s WordNet. Full sources and licences.