noun
successor
suk-SES-er/səkˈsesər/
A person or thing that takes another's place in a role or position.
The manager trains her successor before she leaves the company.

Etymology
A successor is literally one who comes after. The underlying verb also meant taking another's place, connecting simple sequence with replacement in an office or role.
In context
naming your successor is admitting you're going to die.
More examples
- The board names a successor to the retiring president.
- This camera is the successor to our most popular model.
- His successors continue the tradition he started.
Forms
successor · successors
succeed verb — To take another person's role or position.
succession noun — The act of taking over another's position.
Similar words
- replacement
- May substitute temporarily rather than follow someone in office.
- heir
- Inherits property or a title rather than any role.