What is another word for "antonym"?

Roget's Thesaurus (1911) lists these synonyms for "antonym": against, agnomen, all, and, antarctic, antipodal, antipodes, antonomasia, arctic, asunder, baptism, baptize, bean, by-name, byword, call, cant, caption, characterize, christen, clepe, cognomen, cognominal, cognomination, compellation, contraposition, contrariety, converse, convertible, counterpart, define, denominate, denomination, description, designate, designation, diametrically, distinguish, dub, empty.