The term "successor to Peter in the" is commonly used to refer to the head of the Roman Catholic Church. However, there are many synonyms that can be used to convey the same meaning. For example, the term "Bishop of Rome" can be used interchangeably with "successor to Peter." Alternatively, "Pope" is another commonly used term that can be used to refer to the leader of the Catholic Church. Other synonyms include "Vicar of Christ" and "Holy Father." These terms all signify the authority and leadership of the individual who holds the position, and they are often used to show respect and reverence for the Church's highest-ranking official.