WordNet records no synonym and no antonym for chiron. 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.
(Greek mythology) the learned centaur who tutored Achilles, Asclepius, Hercules, Jason, and other heroes
an asteroid discovered in 1977; it is unique in having an orbit lying mainly between the orbits of Saturn and Uranus
Synonyms, antonyms and the broader and narrower relations for chiron come from Princeton University’s WordNet. Full sources and licences.