do·er

[doo-er]
noun
1.
a person or thing that does something, especially a person who gets things done with vigor and efficiency.
2.
a person characterized by action, as distinguished from one given to contemplation.
3.
Australian. an amusing or eccentric person; character.

Origin:
1300–50; Middle English. See do1, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
doer (ˈduːə) [Click for IPA pronunciation guide]
 
n
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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00:10
Doer is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

doer
c.1300, agent noun from do.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My secret endeavor is, obviously, to secure my position forever as the doer of
  the number one romantic act in your life.
We have, largely, repudiated objective morality in favour of relativism where
  everything is good in the eye of the doer.
For example, the company may be the named respondent but the supervisor would
  be the doer.
My point was that, except in extreme cases, bullying is in the eye of the
  beholder or doer.
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