handler
nounUK /ˈhændlə/
US /ˈhændlər/
A person who takes care of or trains an animal.
The dog's handler led it around the show ring.
OTHER MEANINGS
2. A person who moves or manages something, like baggage or a tool.
The baggage handler loaded the suitcases onto the plane.
3. A person who helps a famous person or leads a group.
The singer's handler told the crowd to stay calm.
4. A part of a computer program that deals with events or data.
The program uses an error handler to fix mistakes.