Educational online games and educational videos are classroom methods that incorporate multimedia into language teaching. Previous studies have suggested that the use of online games and educational videos in language learning enhances student performance. However, no studies have been done using three different groups to examine whether online games or educational videos are more beneficial for language learning than conventional teaching, if at all. This study intended to fill the existing gap in research about vocabulary acquisition, using an experimental research design with a pre-test at the beginning of the program and a post-test at the end of the program. These tests were administered to 93 seventh grade EFL students. The participants were divided into three groups and taught using educational videos, online educational games, and conventional teaching respectively. Statistical analysis showed that there was a significant difference among these three groups. The use of educational online games resulted in higher achievement than the educational videos and conventional teaching. These results suggest that multimedia learning has a significant effect on vocabulary enhancement.