In principle, *accuracy* is the fraction of properly predicted cases.

This is the same as `1 - the fraction of misclassified cases` or `1 -  the *error* (rate)`.

Both terms may be sometimes used in a more vague way, however, and cover different things like class-balanced error/accuracy or even F-score or AUROC -- it is always best to look for/include a proper clarification in the paper or report.

Also, note that test error rate implies error on a test set, so it is likely 1-test set accuracy, and there may be other accuracies flying around.