This article overviews the historical transition of the domain nomenclature of Korean language education and explores the functions and the rules applied in naming the domains. In the Korean education, listening, speaking, reading, writing, grammar and literature have changed their names several times, depending on the transition of Korean curriculum. The domain name has several functions - 1) defining the contents for instruction in Korean language education, 2) delineating the contents for education pertaining to each domain, and finally, 3) characterizing the contents of each domain. Therefore, one needs a proper method for nomenclature, considering its functions. The principles for nomenclature in Korean education have been discriminability, representability and clarity. Discriminability signifies that one domain of Korean education should be discriminable from another by the names. Representability means the name should represent the contents of each domain. Clarity means that the name of each domain should clearly show the contents and the characteristics of education. The domain name ‘listening-speaking’, which was born when the 2011 Korean Curriculum changed the domain nomenclature system based on five domains, is not suitable as a domain name. The ‘listening-speaking’, as a domain name does not meet the principles of representability and clarity. In stead of combining the two previous domain names-listening and speaking-in parallel, I suggest for consideration a more comprehensive name, ‘oral communication’, which represents the characteristics of the domain more properly.