What two "executive powers" are held by the senate? what is the role of the house and senate in the impeachment process?

The Senate has the following "executive powers"
1) Ability to impeach a government official.
2) Ability to investigate wrongdoings of a government official (like the President).

In the impeachment process, the House of Representatives is the group of people who can officially charge a person with a crime. The Senate, on the other hand, conducts the actual impeachment trials. The Senate acts like the judge and jury does in a normal court case. In this scenario, the House of Representatives would be the prosecuting lawyer.