Typically a transurethral resection of the prostate (turp) is assigned to the root operation of

The answer would be excision

The different between excision and resection is that excision removes a part of the organ while resection removes it completely.
The operation of transurethral resection of the prostate(TURP) removes a part of the prostate that obstructs the urinary tract. It doesn't remove the entire prostate.