Nouns are words that name objects or living things. Any word that names an object or person is a noun (such as chair, table, wall, Anna, London, jacket, etc.)
So, in this sentence, “clock” and “batteries” are nouns, while “the” is an article (like “a” or “an”) and “needs” is a verb (an action word, like wants, is, has, runs, sits, etc.)
