copter ( synonym found)
Definition of copter:

(n) : a helicopter
"2005 Shellie shouts something I can't quite make out over the racket of a passing police copter. — Sin City (the film)"
Definition of copter:

(n) : a helicopter
"2005 Shellie shouts something I can't quite make out over the racket of a passing police copter. — Sin City (the film)"
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