knock

As a noun knock

is an abrupt rapping sound, as from an impact of a hard object against wood.

As a verb knock

is (dated) to rap one's knuckles against something, especially wood.

As an adverb knockingly is

(rare) with a knocking sound or motion.

As nouns the difference between knock and knockback

is that knock is an abrupt rapping sound, as from an impact of a hard object against wood while knockback is a blow that causes the recipient to fall or move backwards, a knock back; a recoil.

As a verb knock

is (dated) to rap one's knuckles against something, especially wood.

As nouns the difference between knock and cottabus

is that knock is an abrupt rapping sound, as from an impact of a hard object against wood while cottabus is a game played by throwing wine at metal disks or pans, trying to knock them down or make them sink in a basin of water.

As a verb knock

is (dated) to rap one's knuckles against something, especially wood.