WordNet sense 1 (one who disparages or belittles the worth of something):

detractor, depreciator, disparager

WordNet sense 2 (either of two soft fleshy milk-secreting glandular organs on the chest of a woman):

bosom, breast, tit

WordNet sense 3 (a device (usually metal and ornamental) attached by a hinge to a door):

rapper, doorknocker