WordNet records no synonym and no antonym for clovis culture. 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.
the Paleo-American culture of Central America and North America; distinguished chiefly by sharp fluted projectile points made of obsidian or chalcedony
Synonyms, antonyms and the broader and narrower relations for clovis culture come from Princeton University’s WordNet. Full sources and licences.