What term describes words that mean the same thing?

The term that describes words that have the same or nearly the same meanings is "synonyms." Synonyms are crucial in language as they offer variety and help avoid repetition in writing and speech. For instance, the words "happy" and "joyful" are synonyms because they convey similar meanings related to a positive emotional state. Recognizing and using synonyms can enhance vocabulary skills and improve the richness of communication.

Other terms provided in the options do not refer to words with the same meaning. Antonyms refer to words that have opposite meanings, such as "hot" and "cold." Metonyms are words that represent something related or associated with the concept, like using "the crown" to refer to royal authority. Alliterations are a literary device where the same consonant sound begins multiple words in a phrase, such as "She sells seashells." Understanding these distinctions can further clarify the importance of synonyms in language.