biff vs smack

biff

verb
  • To punch or hit. 

  • To discard; to throw out; to throw away. 

  • To wipe out; to faceplant; to fall. 

intj
  • The sound of a person being punched or hit. 

noun
  • A sudden, sharp blow or punch. 

  • A wipeout. 

smack

verb
  • To slap or hit someone. 

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

  • 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. 

noun
  • 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. 

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

  • Heroin. 

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