The antonym of "antonym" is "synonym". Here is an analysis in English:
The term "antonym" refers to a word that has the opposite meaning of another word. For example, "hot" and "cold" are antonyms, as are "up" and "down", "happy" and "sad". They represent polarities or contrasts in meaning.
On the other hand, a "synonym" is a word that has the same or nearly the same meaning as another word. For instance, "big" and "large", "happy" and "glad", "begin" and "start" are synonyms. Synonyms are used to express the same concept or idea in different words, providing variety and nuance in language.
So, while antonyms highlight differences and opposites in meaning, synonyms emphasize similarity and equivalence. They are two opposing concepts in the study of word relationships, with antonyms being about contrast and synonyms being about similarity.