The objective of the study was to find out the correlation between students vocabulary achievement. The population was the second grade student of SMK Negeri Binaan PEMPROVSU. The population were 5 class consist 121 students. This study took a class TKJ and TKR as a sample by using Cluster Random Sampling. In gathering data, used a match test to measure vocabulary mastery and oral test to measure fluency in speaking English. In analyzing data, this study used Pearson Product Moment Formula. After analyzing, it was found r- calculated 0,873. It means that r-calculated was higher than r- table. So the relationship between two variables above were significant. And percentage if correlation between students’ vocabulary achievement and fluency in speaking English was 76,22%. It means that the students’ vocabulary achievement will support fluency in speaking English
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