Attention to vocabulary and finding appropriate strategy to learn new vocabularies has always been challenging for learners or even teachers. Researchers' consideration to vocabulary has been growing since mid. 1980s. In this regard, various researchers and teachers stated one or some instructions are more helpful for learners. This study is an attempt to investigate the effect of Isolated, Integrated, and Synonym Generation vocabulary instruction on writing skill among Intermediate EFL learners. For this purpose, 77 male and female learners were chosen through administering a piloted...