A noun is a word other than a pronoun which is used to identify any of a class of people, places, or things (as what is known as a common noun), or to name a particular one of these (as what is known as a proper noun).
Examples of Common Nouns:
People > Baby, businessperson,child, father, grandmother,man, minister,mother,salesclerk,student,teacher, teenager, toddler, woman
Animals > Alligator, bear, bird,cat,cricket, dog, lion, tiger, wolf
Things > Book,boots,coat,computer,iPad,pencil, table, truck
Places > City, coffee shop,continent, country, park, restaurant, state, zoo