It could be called a lot of things, depending on the circumstances:
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The 25th amendment to the Constitution refers to what happens if a President dies or resigns from office. It says that the Vice President takes over for the President if he is unable to do his duties.
In accordance with Amendment 25 of the United States Constitution, if the vice president dies, resigns or is otherwise removed, the President of the United States nominates his or her replacement. That person assumes the position of vice president after he or she has been confirmed by a majority vote by both houses of Congress.
The person who replaces the president after he dies is the Vice President.
The duties of the Vice President is to support the President's agenda, they are in charge of the Senate, so if they have to opportunity to get in there with the senators and make some good policy changes. The also cast a tie breaking vote in the Senate. Also if something were to happen to the President, they are the one that would replace him.
vice president, & if he dies, the speaker of the house