Which statement accurately describes antonyms?

Antonyms are defined as words that have opposite meanings, which is precisely what the correct choice conveys. Understanding antonyms is essential in language and communication, as they help to clarify and emphasize differences in meaning. For instance, in the context of teaching, using antonyms can enhance vocabulary development and comprehension by allowing learners to see contrasting concepts more clearly.

The other options describe concepts that do not align with the definition of antonyms. Words with the same definition refer to synonyms, which are entirely different. Words that are often confused may relate to homophones or words with similar sounds but distinct meanings. Lastly, words that have a similar sound pertain to phonetics rather than semantic relationships. Hence, the definition that accurately characterizes antonyms is that they are words that have opposite meanings.