The purpose of this paper is to report the outcomes of grammar terminology standardization, which has been conducted as a part of ‘The Development of Standard Korean Language Grammar’ project. Focusing on the grammatical terms of < Standard Korean Language Grammar >, one of the projects conducted by the National Institution of Korean Language, we have thoroughly examined the whole procedures and selection criteria of terminology standardization. This paper suggests the detailed list of obtained grammatical terms in < Appendix： the list of modified terminologies >. Building on this list, we examine the differences of grammatical terms between existing grammar books, textbooks, Linguistic Norms, and Standard Korean Language Dictionary. Through the above-mentioned process, we analyze terminologies based on the aspects of phonology, morphology, and syntax. We emphasize that clarifying the concept of each term to fill the gap between < Standard Korean Language Grammar > and existing publications, including grammar books and textbooks. This paper explains why < Standard Korean Language Grammar > describes some terms inevitably in a different way from how existing Linguistic Norms explain them. Since this project relied on Standard Korean Language Dictionary at the initial stage of selecting terminologies, the differences of terms between < Standard Korean Language Grammar > and Standard Korean Language Dictionary are investigated in depth. We thus recognize the fundamental limits of Standard Korean Language Dictionary.