WordNet records no synonym and no antonym for wichita. 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 member of the Caddo people formerly living between Kansas and central Texas
the largest city in Kansas; located in southern Kansas on the Arkansas River
the Caddoan language spoken by the Wichita
Synonyms, antonyms and the broader and narrower relations for wichita come from Princeton University’s WordNet. Full sources and licences.