Noun is the name of a person, place, thing, animal or idea. Everything in this world has a name and when we give anything in this world a name that name is called a noun.
Boy is doing the work (Noun-Person)
I went to Lahore (Noun-Place)
They bought the book (Noun-Thing)
They loved their dog (Noun-Animal)
I do not like have the strength (Noun-Idea)