depreciator, detractor, disparager, knocker - one who disparages or belittles the worth of something
boob, bosom, breast, knocker, tit, titty - either of two soft fleshy milk-secreting glandular organs on the chest of a woman
knocker - a person who knocks (as seeking to gain admittance)
Example:- open the door and see who the knocker is
doorknocker, knocker, rapper - a device (usually metal and ornamental) attached by a hinge to a door
knocker - (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person