a person or thing that levels.
Also, especially British, leveller.

1590–1600; level + -er1

self-leveler, noun
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World English Dictionary
leveller or (US) leveler (ˈlɛvələ)
1.  a person or thing that levels
2.  a person who works for the abolition of inequalities
leveler or (US) leveler

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Information technology is not the great leveler that enthusiasts champion, but
  it also is not as far out of reach as skeptics say.
Not a complete leveler but it would help reduce the disparity and contribute
  towards reducing the federal deficit.
Global recession is a great leveler, its seismic shocks felt in big and small
  nations alike.
The steel dock plate was part of a dock leveler that was being replaced.
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