Terminology of the designations of the field “of the part of the speech” in the idea of the Kazan' linguistic school

Article is dedicated to the study of the terminology of Kazan' linguistic school with the support to the materials of the linguists XIX – of first third OF XX of the substances in the comparative – comparative plan. By the way of the comparison of the terms of the field “of the part of the speech” and the corresponding definitions, utilized by the different authors, are determined the reasons for differences and the basic directions of the evolution of special designations from the field of morphology.