A person who calumniates (slanders, or makes personal attacks upon, others).
A critic; one who disparages.
A person who knocks.
A person who knocks (denigrates) something.
One who defaults on payment of a wager.
A woman's breast.
A large cockroach, especially Blaberus giganteus, of semitropical America, which is able to produce a loud knocking sound.
A large, boulder-shaped outcrop of bedrock in an otherwise low-lying landscape, chiefly associated with a mélange.
A device, usually hinged with a striking plate, used for knocking on a door.
A mechanical device in a pinball table that produces a loud percussive noise.