What is the noun of unrelated?

There isn't a single, perfect noun for "unrelated." However, depending on the context, you can use several options:

* Lack of relation: This phrase emphasizes the absence of connection.

* Independence: This focuses on the fact that the things are separate.

* Disconnection: This highlights the absence of a link or relationship.

* Unrelatedness: This is a direct noun form of the adjective "unrelated."

* Divergence: This implies a difference in origin or development.

The best word to use depends on the specific situation and the meaning you want to convey.