This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who plots or schemes, who formulates plans.

n. One who is given to scheming.

n. One who forms schemes; a projector; esp., a plotter; an intriguer.

n. One who schemes or contrives; a projector; a contriver; a plotter.

n. a planner who draws up a personal scheme of action

"Tennyson was also known as a schemer and operator."

deviser    planner    contriver   

politician    angler   

projector    intriguer   

beamer    beemer    creamer    deemer    dreamer    femur    leamer    lemur    reamer    screamer   

manipulator    impostor    swindler    charlatan    intriguer    speculator    blackmailer    seducer    trickster    scoundrel