word class

“The word class defined him. In my view, there will never be another with such multiple talents.”

It has been difficult for him to learn how to speak the language and understand its word classes, like nouns and pronouns.

It would be more logical to reverse the proposition, and turn it into a definition of the word class: "A class is the indefinite multitude of individuals denoted by a general name."

The word class has been used, but perhaps improperly, for classification is almost impossible.

Around this draw a larger circle in which you write the word class.