What is a noun?

A noun is defined as a person, place, thing, or idea, making this choice the correct one. Nouns serve as the building blocks of language by allowing us to name and identify the objects, individuals, locations, and concepts we encounter in the world. For instance, in a sentence like "The dog ran to the park," both "dog" and "park" are nouns, representing an animal and a location respectively.

The role of nouns is fundamental in structuring sentences and conveying meaning, as they can act as subjects, objects, or indirect objects within a sentence. Recognizing nouns helps in understanding the overall grammatical framework and sentence construction.

The other options describe different parts of speech that serve unique functions. One option refers to adjectives, which are words that describe nouns, while another refers to pronouns, which are used to replace nouns. The last option mentions adverbs, which modify verbs. Each of these plays a distinctive role in language but does not capture the core definition of a noun as a person, place, thing, or idea.