We have defined the term "Impeachment" in our legal definitions. See https://definitions.uslegal.com/a/articles-of-impeachment/
Impeachment can be used to remove a Government Elected Official, including the President, provided the proper legal procedures and laws established by the Constitution, US Code and interpretations of same by the US Supreme Court.
Articles of Impeachment begin the process.
Other terms include the following:
“The President, Vice President and all Civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.”
— U.S. Constitution, Article II, section 4