hierarchy
Meaning: a system with ranked groups, usually according to social, economic, or professional class
Usage: Women found it very difficult to break into the upper ranks of the department’s hierarchy.
incumbent
Meaning: the person who currently holds an office or position
Usage: The incumbent mayor answered questions during the school assembly.
coronation
Meaning: the act of crowning
Usage: The new king’s coronation took place in the grand hall.
tenure
Meaning: the period of holding an office or position
Usage: During her tenure as club president, Maya started a tutoring program.
succession
Meaning: the process of following another in office or rank
Usage: The council planned a peaceful succession after the mayor retired.