what test is the nonparametric equivalent of the Pearson cor

what test is the nonparametric equivalent of the Pearson correlation coefficient?

I answered this already so perhaps someone could tell me what are primary limitations of nonparametric tests

Solution

Nonparametric methods usually lack the power as compared with more traditional approaches Particularly if the sample size is small or if the assumptions for the corresponding parametric method (e.g. Normality of the data) hold.

Nonparametric methods are inclined toward hypothesis testing rather than estimation of effects.

Tied values are also sometimes problematic when these are common, and adjustments to the test statistic may be necessary.