
1) Building site sight 2) Construction equipment 3) Critic 4) Device for sorting eggs 5) Landscaping machine 6) Paving aid 7) Professor, after an exam 8) Professor, usually 9) Roadbed-repair vehicle 10) Sorting machine 11) Teacher after a test 12) Teacher, after exams 13) Teacher, during exam week 14) Teacher, frequently 
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https://www.crosswordclues.com/clue/grader

1) Classer 2) Woolsorter 
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https://www.crosswordclues.com/clue/grader

 A grader, also commonly referred to as a road grader, a blade, a maintainer, or a motor grader, is a construction machine with a long blade used to create a flat surface during the grading process. Typical models have three axles, with the engine and cab situated above the rear axles at one end of the vehicle and a third axle at the front end of t...
Found on 
http://en.wikipedia.org/wiki/Grader

• (n.) One who grades, or that by means of which grading is done or facilitated.
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http://thinkexist.com/dictionary/meaning/grader/

in excavation, precision finishing vehicle for final shaping of surfaces on which pavement will be placed. Between its front and rear wheels a ...
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http://www.britannica.com/eb/a-z/g/55
 Grad'er  noun
Grad'er  noun  One who grades, or that by means of which grading is done or facilitated. 
Found on 
http://www.encyclo.co.uk/webster/G/48

[
n] - a judge who assigns grades to something
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http://www.webdictionary.co.uk/definition.php?query=grader
  No exact match found.