Concrete noun

 What is "concrete noun"?

A concrete noun refers to something that you can perceive with your five senses—seeing, hearing, touching, tasting, or smelling. These nouns represent physical objects, people, or places that you can physically interact with.

Here are some examples:
Dog - You can see, touch, and hear a dog.
Apple - You can see, touch, taste, and smell an apple.
Mountain - You can see and touch a mountain.
Coffee - You can see, smell, taste, and touch coffee.
Book - You can see and touch a book.

These kinds of noun are countable; they can be counted and made plural.
Examples: three dogs, five books, etc.

Concrete nouns are the opposite of abstract nouns, which refer to ideas, qualities, or states that cannot be perceived with the senses, such as "freedom" or "happiness."

Other concrete nouns refer to substances, liquids, gases*, etc. Let's see some examples below:
- substances: glass, skin, iron, flesh, silicon, etc.
- liquids: water, blood, wine, rain, milk, etc.
- gases: air, gas, oxygen, smoke, etc.

We call these mass nouns, or uncountable nouns. They describe masses which can't easily be devided into individual items; hence we do not normally count these nouns or make them plural.**

Notes:
* Gases are considered "concrete" even though we cannot (easily) see them.
** There are special usages where the uncountable noun is plural. For example, we used the word gases above to mean "kinds of gas".

I hope this article helps. If you have any question, please ask in the comment section.