operator (n.)

• activist
• actor
• administrator
• adventurer
• agent
• architect
• author
• beaver
• central
• coconspirator
• conductor
• conspirator
• creator
• director
• doer
• driver
• engineer
• enthusiast
• executant
• executor
• executrix
• exploiter
• fabricator
• faker
• finagler
• fraud
• functionary
• go-getter
• gunslinger
• handler
• hustler
• intriguer
• kingmaker
• machinator
• maker
• manager
• maneuverer
• manipulator
• medium
• militant
• mover
• operative
• opportunist
• performer
• perpetrator
• pilot
• plotter
• plunger
• powerhouse
• practitioner
• producer
• runner
• sawbones
• scalper
• schemer
• smoothie
• speculator
• stag
• steersman
• strategist
• subject
• superintendent
• supervisor
• surgeon
• telephonist
• winner
• wire-puller
• worker