(n.) One who makes or writes comments; a commentator; an annotator.

abbreviate abridge annotator asphyxiate belittler black out bleach blip blot out blue-pencil bottle up bowdlerize cancel captious critic carper caviler censurer choke off clamp down on clean up cognoscente commentator commenter common scold connoisseur conscience conscientiousness cork cork up crack down on critic criticaster criticizer critickin criticule cross out crush cut cut out damp down delete drown edit edit out editor erase ethical self excise expunge expurgate extinguish faultfinder frondeur gag grace hold down hugger-mugger hush hush up hush-hush inner arbiter inward monitor jump on keep down keep under kill literary critic man of letters momus monopolist moral censor muckraker muffle muzzle narrow nitpicker omit pettifogger pour water on protectionist purge purify put down quash quell quench quibbler repress rescind restrain restrict restrictionist reviewer rub out scholiast scold screen shush shut down on silence sit down on sit on smash smellfungus smother social conscience social critic squash squelch stanch stifle strangle strike strike off strike out stultify subdue suffocate superego suppress tender conscience textual critic throttle twinge of conscience voice of conscience void