Uses Of Noun:
Nouns are words you use to talk about people, places, and things.

Singular
This is a book.
This is a singular noun. That means that it stands for one of something.

Plural
And these are books.
This is a plural noun. That means that it stands for more than one of something.

English usually forms the plural by adding an "s" to the singular noun. Sometimes, though, the plural looks like a completely different word:

There aren’t that many words in English that form the plural this way. It’s much more common to form the plural by adding "s."

Here are some more examples of English nouns:

Count And Noncount Nouns
Count nouns are nouns that can be counted (e.g., a book, two friends, three cars, etc.). A count noun may be preceded by a or an in the singular; it takes a final -s or -es in the plural.
Noncount (or mass) nouns refer to things that cannot be counted (e.g., money, rain, snow, butter, wind, air, clothing, etc.). Noncount nouns are not preceded by a or an and have no plural form.
COMMON NONCOUNT NOUNS

Some nouns can be both count and noncount nouns:
--We drank some wine. (Noncount)
--We ordered three wines. (Count)
(It is implicit that three different wines were ordered.)