Controller
WordNet
noun
(1) A mechanism that controls the operation of a machine
"The speed controller on his turntable was not working properly"
"I turned the controls over to her"
(2) Someone who maintains and audits business accounts
(3) A person who directs and restrains
WiktionaryText
Noun
- a person who controls something
- a person who audits, and manages the financial affairs of a company or government; a comptroller
- a mechanism that controls or regulates the operation of a machine, especially a peripheral device in a computer