What do we call words that have opposite meanings in semantics?

Words that have opposite meanings in semantics are referred to as antonyms. Antonyms provide a clear contrast between two different ideas or concepts, enriching language by allowing for more precise communication. They play an essential role in understanding language as they help in developing vocabulary, enhancing expressive capabilities, and facilitating nuanced discussions. For example, the words "hot" and "cold" are antonyms, as they describe opposing temperature characteristics.

Homonyms are words that sound alike but have different meanings, while synonyms are words that have similar meanings. Metonyms involve substituting the name of one thing with the name of something else closely associated with it, which does not pertain to opposite meanings. Each of these categories serves unique functions in language, but only antonyms specifically address the concept of opposing meanings.