grader

[grey-der]
noun
1.
a person or thing that grades.
2.
a pupil of a specified grade at school: a fourth grader.
3.
a machine for grading.

Origin:
1840–50, Americanism; grade + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
grader (ˈɡreɪdə)
 
n
1.  a person or thing that grades
2.  a machine, either self-powered or towed by a tractor, that levels earth, rubble, etc, as in road construction

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

grader

in excavation, precision finishing vehicle for final shaping of surfaces on which pavement will be placed. Between its front and rear wheels a grader carries a broad mechanically or hydraulically controlled blade that can be extended from either side. Either end of the blade can be raised or lowered. Graders may be used for shallow ditching, but most models are used to assist other earth-moving equipment and to smooth roads, fills, and cuts.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Well if she is a third grader you have a shot, other wise.
Your article says nothing already not easily understood by a fifth grader.
No eighth grader would be proud of its syntax or even its spelling.
Shooting a breed of dog that would loose a fight with a first grader is a
  mistake.
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