operator

noun

1
a shrewd or unscrupulous person who knows how to circumvent difficulties
2
an agent that operates some apparatus or machine
the operator of the switchboard
3
someone who owns or operates a business
who is the operator of this franchise?
4
a speculator who trades aggressively on stock or commodity markets
5
(mathematics) a symbol or function representing a mathematical operation

Also useful for “operator”:Unscrambler— Rearrange the letters in “operator”