What is tool as a concrete noun?

A tool as a concrete noun refers to a physical object used to perform a specific task or function.

Here are some examples:

* Hammer: A tool used for striking nails.

* Screwdriver: A tool used for driving screws.

* Wrench: A tool used for tightening or loosening nuts and bolts.

* Knife: A tool used for cutting.

* Pencil: A tool used for writing or drawing.

In contrast to an abstract noun, a concrete noun can be perceived by the senses. You can touch, see, hear, smell, or taste a tool.