WordNet records no synonym and no antonym for comanche. 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 Shoshonean people who formerly lived between Wyoming and the Mexican border but are now chiefly in Oklahoma
the Shoshonean language spoken by the Comanche
Synonyms, antonyms and the broader and narrower relations for comanche come from Princeton University’s WordNet. Full sources and licences.