A common noun is the name given in common do any and every personal thing of same kind are class.
Example :– Boy, girl, child, uncle, teacher, actor, Town, street, school ,Valley ,book, table, house.
The difference between proper nouns and common nouns can be understood by the following examples.
Albert was a great King
October is the name of particular King.
The noun under column A are the proper nouns while under column B are common noun.