Detractor

n.

1.

One who detracts; a derogator; a defamer. His detractors were noisy and scurrilous. - Macaulay.

Noun

1.

detractor - one who disparages or belittles the worth of something Synonyms: depreciator, disparager, knocker

backbiter, cynic, defamer, depreciator, detract, disparager, faultfinder, hatemonger, knocker, libeler, maligner, muckraker, mudslinger, slanderer, take away, traducer, vilifier