When the word "estimator" is used without a qualifier, it usually refers to point estimation. The estimate in this case is a single point in the parameter space. There also exists another type of estimator: interval estimators, where the estimates are subsets of the parameter space.
when the word "estimator" is used without a qualifier it usually refers to point estimation the estimate in this case is a single point in the parameter space there also exists another type of estimator interval estimators where the estimates are subsets of the parameter space