This study aimed to measure the effectiveness of Hyponym Games in improving the vocabulary mastery of 7th graders of SMP Muhammadiyah 01 Sukajaya. It was a quantitative study applying pre-experimental approach with one group of pre-test and post-test design. A total number of 30 students participated in this study. The results of t-test statistical data analysis revealed that in the pre-test, the average score gained by the students was 54, while in the post-test, the students obtained the average score of 74.73. Additionally, the calculation of the data showed that in the significance level of 0.05, tcalwas 7.0 with ttableof 1.701, or 7.0 > 1.701. Therefore, this study confirms that Hyponym Games are effective to enrich students’ vocabulary mastery.
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