A noun is the name of a thing, place, or person, e.g., chair, book, cup, room, doctor, New York, London.

Nouns are categorized into two types::

1. Common Noun
2. Proper Noun

Common nouns and proper nouns are also known as generic nouns and particular nouns, respectively.

A common noun is the name of a common, or general thing, place, or person.

Examples: book, pen, car, room, garden, boy, girl, man, camera, month, day. Each of these refers to a general or common entity.

Common nouns are used to represent somethingl as a member of a group of similar items, rather than to specifiy soemthing.

Example 1.

He eats an apple daily.

In the above sentence, the noun ‘apple’ is a common noun. It simply represents apple as a unit of a group of common things (apples). As, we all know that an apple is a common fruit and can be referred to as a common noun.

Example 2.

She bought a camera.

In this sentence, 'camera' is a common noun. It simply represents apple as a unit of a group of common things (cameras). It refers to any camera as a general device used for photography, rather than a specific one.

Proper noun is a name of a particular or specific thing, person or place.

Examples: London, America, August, Sunday, David, John, Oxford University,. Each of these refers to a unique or specific thing, place or person.

Proper nouns do not denote general categories; they identify specific items. For instance:

• City is a common noun because there can be many cities, but London is a proper noun because it is a specific city.
• University is a common noun, while Oxford University refers to a specific institution.
• Month is a common noun, whereas April denotes a particular month.

 Capitalization of Proper Nouns

The first letter of a proper noun is always capitalized. On the other hand, the first letter of common nouns are not capitalized, but are capitalized only when they come at the beginning of a sentence.

Examples:

They live in London.
She helped David.
He studies at the University of Glasgow.
He will come here in August.
The meeting will be held on Friday.
The author of this book is John Stephen.
He says that Bill Gates is the richest person in the word.

  Rules for Using the Article “The” with Proper Nouns

The article the is sometimes used before proper nouns. The following rules clarify its usage:

1. The is not used before the names of cities or countries, e.g., Paris, London, New York, Canada, America, Mexico. However, it is used for groups of places, e.g., the United States, the Netherlands, the Philippines.
2. The is not used before university names written as Yale University, Oxford University, or Columbia University. It is used when the name includes of, e.g., the University of Oxford, the University of Toronto.
3. The is used before names combining a common noun with a proper noun, as the common noun is specified by the proper noun, e.g., the River Nile, the city of New York, the BMW car.
4. The is used before names of oceans, seas, rivers, deserts, and forests (except lakes and waterfalls), e.g., the Pacific Ocean, the Mediterranean Sea, the Sahara, the Black Forest.
5. The is used before names of geographical regions and points on the globe, e.g., the Middle East, the West, the Equator, the North Pole.
6. The is used before names of organizations, e.g., the Association of Chartered Accountants, the World Health Organization.