Maryland Education Standards. What are Adjectives, Adverbs, Antonyms, Synonyms, and Homographs? An adjective describes a noun or a pronoun. An adverb can tell you how, where, or when something is done. Antonyms are words that mean the opposite of each other. Synonyms are words that have almost the same meaning. Homographs are words that have more than one definition. Read More...