Page "Class (philosophy)" Paragraph 1

There is, in any case, a difference in how we talk about types and kinds versus how we talk about classes.

We say that Socrates is a token of a type, or an instance of the natural kind, human being.

But notice that we say instead that Socrates is a member of the class of human beings.

We would not say that Socrates is a " member " of the type or kind, human beings.

Nor would we say he is a type ( or kind ) of a class.

He is a token ( instance ) of the type ( kind ).

So the linguistic difference is: types ( or kinds ) have tokens ( or instances ); classes, on the other hand, have members.