Summary
In-depth Explanation
A noun can refer to:
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A person: teacher, mother, Bob Smith, architect 
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A place: France, New York City, house, park 
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A thing or object: key, car, building, the Eiffel Tower 
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An animal: dog, mouse, snake, lion 
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An idea: freedom, justice, liberty, equality 
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A feeling: joy, anger, desire, sadness 
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A quality: softness, elegance, beauty, ugliness 
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An action: reading, cooking, swimming, bathing 
Proper vs. Common Nouns
Nouns that refer to something in general are common nouns.
Examples: bridge, person, dog, city
Nouns that refer to specific things are proper nouns. These nouns are capitalized.
Examples: the Golden Gate Bridge, Beyoncé, Lassie, Paris
Abstract vs. Concrete Nouns
Nouns can also be divided into two categories based on if they are tangible/visible or not. Concrete nouns can be seen, felt and experienced through the senses.
Examples: forest, car, steak
Abstract nouns cannot be experienced by the senses. They are concepts, ideas or emotions.
Examples: honesty, love, freedom, justice
Singular vs. Plural Nouns
Nouns can be singular or plural. Regular singular nouns are made plural by adding an -s or -es to the end of the word. Here are some regular nouns in their singular and plural forms:
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dog → dogs 
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bike → bikes 
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train → trains 
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kiss → kisses 
There are also many common irregular plural forms. Common irregular plural forms include:
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person → people 
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child → children 
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man → men 
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woman → women 

