WordNet records no synonym and no antonym for pop art. 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 school of art that emerged in the United Kingdom in the 1950s and became prevalent in the United States and the United Kingdom in the 1960s; it imitated the techniques of commercial art (as the soup cans of Andy Warhol) and the styles of popular culture and the mass media
Synonyms, antonyms and the broader and narrower relations for pop art come from Princeton University’s WordNet. Full sources and licences.