Constructing the LERWL: A Corpus-Based Approach to Identifying Technical Vocabulary in Language Education Research
Technical vocabulary plays a crucial role in ESP learners’ lexical development once general service and academic vocabulary has been established. The present study constructed the Language Education Research Corpus (LERC), an 8,646,901-word corpus compiled from the top 10 Quartile 1 (Q1) Scopus-indexed journals in Language Education. On the basis of this corpus, the Language Education Research Word List (LERWL) was developed through four systematic procedures. High-frequency items were first identified, after which a range criterion was applied to retain words occurring in at least 50% of the target journals. Lexical profiling was subsequently conducted to isolate discipline-specific vocabulary, excluding items listed in the GSL and the AWL. In addition to these quantitative procedures, expert judgment was employed as a qualitative validation measure to ensure disciplinary relevance. The resulting LERWL was then evaluated against (a) the LERC, achieving 5.28% coverage, and (b) an independent corpus of approximately one million words from the same field, achieving 4.75% coverage. These findings indicate that the LERWL provides a substantial and pedagogically meaningful level of lexical coverage within the discipline.