Common Nouns:
People:
* Child
* Teacher
* Doctor
* Friend
* Neighbor
* Athlete
* Musician
* Artist
Animals:
* Dog
* Cat
* Bird
* Fish
* Elephant
* Lion
* Snake
* Insect
Places:
* City
* Country
* Town
* Park
* School
* Hospital
* Restaurant
* House
Things:
* Book
* Pen
* Computer
* Phone
* Car
* Chair
* Table
* Window
Concepts:
* Love
* Happiness
* Sadness
* Anger
* Time
* Space
* Freedom
* Justice
Nature:
* Tree
* Flower
* Sun
* Moon
* River
* Ocean
* Mountain
* Cloud
Food & Drink:
* Pizza
* Bread
* Coffee
* Water
* Chocolate
* Fruit
* Vegetable
* Cake
Other:
* Music
* Movie
* Game
* Painting
* Sculpture
* Story
* News
* Weather
Note: This list is not exhaustive. There are countless other common nouns depending on the context.