Source : Webster's Revised Unabridged Dictionary (1913)

Reviewer \Re*view"er\, n.
   One who reviews or re["e]xamines; an inspector; one who
   examines publications critically, and publishes his opinion
   upon their merits; a professional critic of books.

Source : WordNet®

reviewer
     n 1: someone who reads manuscripts and judges their suitability
          for publication [syn: {referee}, {reader}]
     2: a writer who reports and analyzes events of the day [syn: {commentator}]