successor

/səkˈsɛsər/
noun
  1. A person who follows another in a position, role, or title.
    • The prince is the successor to the throne.
    • The CEO chose her successor before retiring.
    • The new manager was a worthy successor to the previous one.
  2. A thing that comes after another in a series or sequence.
    • The successor to the old bridge was built with modern materials.
    • In the number line, 6 is the successor of 5.
    • This model is the successor to the popular smartphone from last year.