What is the term for a word that has the opposite meaning of another word?

The term that describes a word with the opposite meaning of another word is "antonym." Antonyms are pairs of words that convey opposing concepts, such as "hot" and "cold," or "happy" and "sad." Understanding antonyms is essential in language as it helps in building vocabulary and understanding the nuances of meaning.

Other terminologies included in the options serve different purposes: synonyms refer to words that share similar meanings, like "big" and "large"; adjectives are words that describe nouns, providing characteristics or qualities; and homonyms are words that sound alike but have different meanings, such as "bark" (the sound a dog makes) and "bark" (the outer covering of a tree). Each of these terms plays a distinct role in language and contributes to the richness of communication.