Can the word writing be an adjective?

Yes, "writing" can be used as an adjective, but it's a bit less common than using it as a noun or verb. It usually refers to something related to the act of writing.

Here are some examples:

* Writing style: Describes the author's particular way of writing.

* Writing desk: A desk specifically designed for writing.

* Writing contest: A competition where participants submit written works.

In these examples, "writing" modifies the nouns "style," "desk," and "contest" to describe their specific purpose or characteristic.