a person or thing that does something, especially a person who gets things done with vigor and efficiency.
a person characterized by action, as distinguished from one given to contemplation.
Australian. an amusing or eccentric person; character.

1300–50; Middle English. See do1, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doer (ˈduːə)
1.  a person or thing that does something or acts in a specified manner: a doer of good
2.  an active or energetic person
3.  a thriving animal, esp a horse

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, agent noun from do.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My point was that, except in extreme cases, bullying is in the eye of the
  beholder or doer.
The doer is the student and the helper takes on the role of teacher.
He is more of a doer than a communicator, he insists.
We have, largely, repudiated objective morality in favour of relativism where
  everything is good in the eye of the doer.
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