Final answer:
A noun is a part of speech that names a person, place, thing, or idea.
Step-by-step explanation:
Noun is a part of speech that is used to name a person, place, thing, or idea. It is one of the basic building blocks of the English language. For example, in the sentence 'The cat is sleeping,' 'cat' is a noun because it is the name of an animal.
Learn more about Parts of speech