Basically, “The President … shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.” The president’s power can only be used to pardon someone for a federal crime, not a state one. Someone who has been convicted of a federal crime and wants to be pardoned makes a request for a pardon to the Justice Department’s Office of the Pardon Attorney, which assists the president in exercising his pardon power. Department rules tell pardon seekers to wait at least five years after their conviction or their release from prison, whichever is later, before filing a pardon application.
Definition of a privateer:an armed ship owned and officered by private individuals holding a government commission and authorized for use in war, especially in the capture of enemy merchant shipping.
The difference is that the free-exercise clause prevents the government from interfering with your religious beliefs and their free practice, while the establishment clause prevents the government from establishing its own religion and practicing it as an official religion of the state.