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This research aims to determine the effectiveness of teaching vocabulary through the Hangman game for high school students. This research used a pre-experimental design with a one-class pre-test and post-test design. The samples are 30 second-grade students from a private Islamic junior high school in Majene, West Sulawesi, Indonesia. Teaching observation and documentation were the techniques used. This research was analysed using T-Test statistical analysis to determine the differences in English vocabulary scores in the Hangman game. This research showed that the students' vocabulary significantly differed between the pre-test and post-test mean scores. The mean score of the pre-test was 68.8, and the mean score of the post-test was 79.7. The Hangman Game could improve the students' vocabulary by as much as 16%. It described clearly that the experiment's treatment has been going well, and the students' ability in nouns has increased. Thus, the Hangman Game technique effectively improved high school students' vocabulary mastery of singular and plural nouns. Most students felt happy during the vocabulary learning process taught using the Hangman Game.

Teaching; vocabulary; Hangman game