Abstrak. Penelitian ini bertujuan untuk meneliti apakah ada perbedaan yang signifikan secara statistik pada penguasaan kosakata siswa setelah mereka diajarkan melalui guessing game. Penelitian ini adalah penelitian kuantitatif. Subjek penelitian ini sebanyak 30 siswa dari kelas 7 pada SMPN 10 Bandar Lampung. Tes kosakata digunakan sebagai alat pengumpulan data. Data ini di analisis menggunakan Repeated Measures t-test dengan tingkat signifikan p0.05. Hasil penelitian menunjukkan bahwa secara statistik ada perbedaan yang signifikan pada penguasaan kosakata siswa setelah penerapan guessing game. Dapat disimpulkan bahwa guessing game memfasilitasi siswa untuk meningkatkan penguasaan kosa kata mereka. Abstact. The aim of this research was to find out whether there was a statistically significant difference of the students’ vocabulary mastery after they were taught through guessing game. This research was a quantitative research. The subjects of this research were 30 students at the seventh grade of SMPN 10 Bandar Lampung. A vocabulary test was used as the research instrument. The data were analyzed by using Repeated Measures t-test with the significant level of p0.05. The result showed that there was a statistically significant difference of the students’ vocabulary mastery after the implementation of guessing game. This suggests that guessing game facilitates the students to improve their vocabulary mastery.  Keywords: vocabulary, vocabulary mastery, guessing game
                        
                        
                        
                        
                            
                                Copyrights © 2019