WordNet records no synonym and no antonym for sotho. 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 Bantu people who inhabit Botswana, Lesotho, and northern South Africa and who speak the Sotho languages
any of the mutually intelligible southern Bantu languages of the Sotho in Botswana and South Africa and Lesotho
1 of the 3 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for sotho.
Synonyms, antonyms and the broader and narrower relations for sotho come from Princeton University’s WordNet. Full sources and licences.