knock vs smack

knock

noun
  • An abrupt rapping sound, as from an impact of a hard object against wood. 

  • A sharp impact. 

  • A batsman's innings. 

  • A blow or setback. 

  • Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it. 

  • Synonym of hunger knock 

  • A criticism. 

verb
  • To criticize verbally; to denigrate; to undervalue. 

  • To kick a ball towards another player; to pass. 

  • To rap one's knuckles against something, especially wood. 

smack

noun
  • A quick, sharp noise, as of the lips when suddenly separated, or of a whip. 

  • A group of jellyfish. 

  • A sharp blow; a slap. See also: spank. 

  • The sound of a loud kiss. 

  • A distinct flavor, especially if slight. 

  • A small sailing vessel, commonly rigged as a sloop, used chiefly in the coasting and fishing trade and often called a fishing smack 

  • A slight trace of something; a smattering. 

  • A form of fried potato; a scallop. 

  • Heroin. 

verb
  • To strike a child (usually on the buttocks) as a form of discipline. (normal U.S. and Canadian term spank) 

  • To slap or hit someone. 

  • To have a particular taste; used with of. 

  • To wetly separate the lips, making a noise, after tasting something or in expectation of a treat. 

  • To indicate or suggest something; used with of. 

  • To get the flavor of. 

  • To kiss with a close compression of the lips, so as to make a sound when they separate. 

  • To make a smacking sound. 

adv
  • As if with a smack or slap; smartly; sharply. 

How often have the words knock and smack occurred in a corpus of books? (source: Google Ngram Viewer )