The Kendall test is a statistical method used to measure the correlation between two variables. However, there are several synonyms for the Kendall test that are used interchangeably in the field of statistics. One common synonym is the Kendall Rank Correlation Coefficient, which refers to the same statistical measure. Another synonym is the Kendall's Tau test, which is essentially the same as the Kendall Rank Correlation Coefficient. Additionally, the Kendall's Tau-b test is a variation of the Kendall test that is used when ties exist in the data. Overall, these synonyms all refer to the same statistical method and are used to measure the correlation between two variables in various research studies.