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Definition of doer:

  1. An agent or attorney; a factor.
  2. One who does; one performs or executes; one who is wont and ready to act; an actor; an agent.


role player, man of action, dynamo, practitioner, proletarian, mover, participant, performer, operator, hard core, thespian, promoter, instrument, producer, high-flier, hustler, activist, perpetrator, agent, ball of fire, factor, actor, woman of action, worker, buccaneer, go-getter, fighter, player, tough nut, tough cookie, means, prole, organizer, trier, histrion.

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