What is the verb for noun class?

There isn't a single verb that directly corresponds to "noun class." However, depending on the context, you could use several verbs to describe the action of classifying a noun:

General terms:

* Categorize: This is a general term for assigning something to a group or category.

* Classify: Similar to "categorize," this verb emphasizes the process of sorting into classes or groups based on shared characteristics.

* Group: This verb emphasizes the act of putting things together based on shared properties.

Specific terms depending on the context:

* Declension: This term is used in grammar, specifically referring to the system of changing noun endings based on grammatical function (e.g., singular/plural, subject/object).

* Conjugation: This term is used for verbs, but it can be used metaphorically to describe the changing of noun endings as well.

* Assign: This verb emphasizes the act of putting a noun into a specific class.

* Identify: This verb implies recognizing and naming the class to which a noun belongs.

The most appropriate verb will depend on the specific situation and the nuance you want to convey.