_1688893181 20230709085941000 Rovedar Daryoushbabazadeh@gmail.com Rovedar Journal of Contemporary Language Research J. Contemp. Lang. Res. 2980-8065 06 25 2023 2 2 Mohadeseh Ramezani Mitra Zeraatpishe Farnaz Farrokh Alaee https://orcid.org/0000-0001-8860-9993 Introduction: Previous inquiries in FL vocabulary knowledge targeted profoundly on the vocabulary pedagogical outcomes and writing improvement, however scant research has been done on the learners’ lexical competence in the writing process. In this spirit, the study endeavored to investigate the relationship between vocabulary size (VS) and vocabulary use, content, and organization in writing besides VS’s predictability in writing performance. Methodology: To this end, 30 intermediate EFL learners’ (15 males, 15 females) were administered on vocabulary size test (Nation, 2012) and Preliminary English Test of writing. The scores were analyzed and the results indicated significant positive relationships between VS and writing scores, and VS and vocabulary use scores. To investigate the predictability of VS in writing elements scores, regression analysis was applied. Results: The Linear regression revealed that VS variable accounts for 88.9% of vocabulary use in writing scores. The results proved the significant relationship between VS and writing on the one hand and VS and vocabulary used on the other hand. Conclusion: Based on the results, The study offers evidence that VS is a significant predictor in vocabulary use knowledge, which is vital for the and mastery of the required knowledge to be an effective writer. 06 25 2023 93 98 https://creativecommons.org/licenses/by/4.0 10.58803/jclr.v2i2.71 https://jclr.rovedar.com/index.php/JCLR/article/view/71 https://jclr.rovedar.com/index.php/JCLR/article/download/71/70 https://jclr.rovedar.com/index.php/JCLR/article/download/71/70 Albrechtsen, D., Haastrup, K., Henriksen, B., & Henriksen, B. (2008). Declarative lexical knowledge. Vocabulary and writing in a first and second language: Processes and development,29 (3), 22-66. DOI: 10.1057/9780230593404_2 Coxhead, A., Nation, P., & Sim, D. (2015). Measuring the vocabulary size of native speakers of English in New Zealand secondary schools. New Zealand Journal of Educational Studies, 50, 121-135. DOI: 10.1007/s40841-015-0002-3 Fageeh, A. I. (2011). 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(2007) A vocabulary size test. The Language Teacher, 31(7), 9-13. Available at: http://jalt-publications.org/tlt Richards, J. C. (2008). Teaching listening and speaking. Cambridge, England: Cambridge University Press. Salma, U. (2015). Problems and practical needs of writing skill in EFL context: An analysis of Iranian students of Aligarh Muslim University. IOSR Journal of Humanities and Social Sciences, 20(11), 74-76. 10.21512/humaniora.v11i2.6388 10.1080/09571730802389975 Tamura, F. (2011). The relationship between vocabulary size and writing. ARELE: Annual Review of English Language Education in Japan, 22, 281-296. DOI: Thombury, S. (2002). How to teach vocabulary. Harlow, Essex: Pearson Education Limited. Viera, R. T. (2017). Vocabulary knowledge in the production of written texts: a case study on EFL language learners. Revista Tecnológica-ESPOL, 30(3), 1-19. Wilkins, D. A. (1972). Linguistics in language teaching. London: Edward Arnold. Yaghchi, M. A., Ghafoori, N., Nabifar, N. 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