“…In the past few decades, research has shown that the richness of lexis, or rather lexical richness, makes an important contribution to second language (L2) writing quality ( Jarvis et al, 2003 ; Olinghouse and Leaird, 2009 ; Ha, 2019 ), and the ability to produce a well-written text is thought to be important to individual success both at school and in the workplace ( Powell, 2009 ). However, it is arduous and challenging for both L1 (first language) and L2 learners to become an advanced writer, because students should, apart from having a good command of vocabulary, learn to compose different genres of writing which require them to employ varied skills and linguistic resources ( Pu et al, 2022 ). In recent years, there has been a growing increase in research that explores language development across writing genres ( Ravid, 2004 ; Beers and Nagy, 2011 ; Qin and Uccelli, 2016 ; Jeong, 2017 ; Yoon and Polio, 2017 ; Bi, 2020 ), and it has been found that in both L1 and L2 writing, argumentative compositions tend to be more linguistically complex than narrative compositions.…”