A common noun is a noun that does not specify any person, object or animal of the same kind, but all of them. 

For example: Student, Book, Dog, Flower, Father, Mother, Children etc.

It basically refers to specific general names of persons, objects, places, things, etc. It acts as the opposite of Proper Noun

Examples:

• Asif is a student . (Student refers to all students. Does not specify any specific student)
• Dogs can be very cute. (Dog means all national dogs. It can be of any breed or type or colour. It can be any dog ​​of any country.)

Common nouns list

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Read more: Types of Nouns