Quiz are activities with rules, goals and elements of fun so they are interesting for students. Students can learn, while students play. This can brighten up the class and bring more variety into language lessons This thesis aims to determine whether the use of synonym and antonym quizzes improves the vocabulary and motivation of first-year students at SMAN 9 Tana Toraja. This study used a quasi-experimental method using cluster random sampling technique. The population of this study was 57 students consisting of two classes. Class X.5 was chosen as the control class consisting of 29 students and Class X.4 was chosen as the experimental class consisting of 28 students. The instruments of this study were vocabulary tests through pre-test and post-test and questionnaires to measure student motivation in the experimental class. The results of this study indicate that using synonym and antonym quizzes can improve vocabulary in the experimental class. The pre-test score was "bad" with an average score of 57.5 while the post-test score was "very good" with an average score of 92.5. The data were analyzed using paired sample t-test and independent sample t-test. The T-test value was 20.84, greater than the t-table value of 2.00. This shows that there is a significant difference between the control class and the experimental class. On the other hand, Ha is accepted. Based on the conclusion, the researcher suggests that the author proposes the goal so that English teachers can apply methods and variations to teach english vocabulary in class by using synonym and antonym quiz because it is proven that synonym and antonym quiz provide positive contributions to students' vocabulary
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