What is the noun of sharp?

The noun of "sharp" depends on the context. Here are some possibilities:

General:

* Sharpness: This is the most common noun form, referring to the quality of being sharp.

* Edge: This refers to the sharp part of an object, like the edge of a knife.

* Point: This refers to the sharp end of an object, like the point of a pencil.

Specific contexts:

* Sharpness: In music, this refers to a specific musical interval.

* Sharp: This can be used as a noun to describe a sharp person, meaning someone who is intelligent and quick-witted.

To give you the most accurate answer, please provide more context about how "sharp" is being used.