This study, which is an experimental research with pre-test and post-test control groups, aims to determine the effectiveness of the Synectics Instructional Model on foreign language vocabulary teaching. The research was conducted with two experimental and two control groups and 82 students taking part in these groups. The experimental application of the research was carried out during the fall semester of 2016-2017, with a total of 16 class hours in English reading course in English preparatory class. Research data was gathered from an English vocabulary achievement test which was designed by the researchers. In the process of analyzing the research data, independent t-tests, Cohen's d effect size test and thematic analysis were used. The major findings reveal that Synectics based vocabulary teaching has a strong effect on the level of learning and the persistence of the learning. On the other hand, there is a considerable difference between the numbers of the words that students learn indirectly in the process in favor of the experimental group students. Finally, the analysis also reveals that the experimental and control group students have variability in terms of the thematic diversity and semantic equivalence of the words learned indirectly in the process.