[n] someone who frequently finds fault or makes harsh and unfair judgments [n] anyone who expresses a reasoned judgment of something [n] a person who is professionally engaged in the analysis and interpretation of works of art
advertising writer, aficionado, allegorist, amateur, annalist, annotator, arbiter, arbiter elegantiarum, arbiter of taste, art critic, author, authoress, authority, belittler, belletrist, bibliographer, bon vivant, book reviewer, buff, captious, captious