Sharpener (noun)

A tool or device used to sharpen a dull or blunt edge, such as a pencil sharpener, knife sharpener, or tool sharpener.

Origin:

From sharpen + -er.

Examples:

1. The pencil sharpener is used to sharpen pencils.
2. The knife sharpener is used to sharpen knives.
3. The tool sharpener is used to sharpen tools such as chisels and plane irons.
4. The sharpener was used to sharpen the pencils for the test.
5. The sharpener was used to sharpen the knives for the kitchen.