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WordNet records no synonym and no antonym for antigen. 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.
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
Synonyms, antonyms and the broader and narrower relations for antigen come from Princeton University’s WordNet. Full sources and licences.