What is a noun for the word deviate?

There isn't a single perfect noun for "deviate," as it can refer to different things depending on the context. Here are a few options, each with slightly different meanings:

General:

* Deviation: This is the most direct and common noun, meaning a departure from a standard, norm, or expected course.

* Divergence: This emphasizes a splitting or branching off from a common point.

* Digression: This specifically refers to a departure from the main topic of discussion.

More specific:

* Aberration: This implies a deviation from what is considered normal or typical, often in a negative way.

* Anomaly: Similar to aberration, this suggests a deviation from what is expected or usual.

* Discrepancy: This emphasizes a difference or inconsistency between two things that should be alike.

The best choice for you will depend on the specific context and the meaning you want to convey.