When we use the word automobile to refer to a category of transport vehicles, we are using this word as a concept. The correct answers is concept
A concept is an abstract idea that takes form in your mind. This is known as the structures of thoughts and beliefs. They are important because it gives a clear explanation of a particular subject.
An automobile, byname auto, also called motorcar or car, a usually four-wheeled vehicle designed primarily for passenger transportation and commonly propelled by an internal-combustion engine using a volatile fuel, this term is generally used for an vehicle when refering to its category.
When we think of the word automobile, the first thing that comes to your mind is a category of transport. The mind connects the thoughts around the structures build. That’s a concept
Thus, when we use the word automobile to refer to a category of transport vehicles, we are using this word as a concept.
To learn more about abstract idea refer here
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