Nouns are naming words: the names of a person, place, thing or idea. There are four different kinds of noun: 

Common nouns  are ordinary, everyday objects or things like books, people, cars or hands. You can see and touch them.

Proper nouns have capital letters to show they are the names of people or places or institutions, as in Mary, John, the Headteacher; Brampton, William Howard School, The Courts, the Police Station, The White Lion.

Collective nouns refer to a group of objects, people, or things.

Abstract nouns are difficult to describe. They refer to feelings, ideas, or concepts. They generally make writing more complex or thoughtful. All of the underlined words above are abstract nouns. You might have used others like love, hatred, problems, difficulties, atmosphere, understanding and beauty.