Here's why:
* It names a quality or concept: Creativity refers to the ability to produce new ideas or things.
* It can be the subject of a sentence: "Creativity is essential in the arts."
* It can be the object of a verb: "We encourage creativity in our students."
However, "creativity" can sometimes act as an adjective when used to describe something:
* "A creativity workshop" - This means a workshop focused on fostering creativity.
It's important to consider the context to determine the correct part of speech.