“…The importance of derivational knowledge for lexical development has long been recognized in the field of English as a second language (L2) and foreign language (EFL) vocabulary research and teaching (Laufer, 2017; Nation, 2013; Sasao & Webb, 2017; Schmitt & Zimmerman, 2002; Thorndike, 1941). Research on derivational knowledge is valuable as it sheds light on how wordlists (e.g., Brezina & Gablasova, 2015; Dang, Coxhead, & Webb, 2017; Nation, 2016), vocabulary tests (Nation & Beglar, 2007; Webb, Sasao, & Ballance, 2017), and language programs should be developed (Graves, Elmore, & Fitzgerald, 2019). It also has methodological implications because it provides an indication of the unit of counting that should be used when calculating the lexical coverage of a text or corpus (e.g., Vilkaitė‐Lozdienė & Schmitt, 2020).…”