WordNet records no synonym and no antonym for cargo cult. 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.
(Melanesia) the followers of one of several millenarian cults that believe salvation will come in the form of wealth (`cargo') brought by westerners; some ascribe divine attributes to westerners on first contact (especially to missionaries)
a religious cult that anticipates a time of joy, serenity, and justice when salvation comes
Synonyms, antonyms and the broader and narrower relations for cargo cult come from Princeton University’s WordNet. Full sources and licences.