slug vs smack

slug

noun
  • A hard blow, usually with the fist. 

  • A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use. 

  • A bullet or other projectile fired from a firearm; in modern usage, generally refers to a shotgun slug. 

  • The last part of a clean URL, the displayed resource name, similar to a filename. 

  • A black screen. 

  • A motile pseudoplasmodium formed by amoebae working together. 

  • A piece of type metal imprinted by a linotype machine; also a black mark placed in the margin to indicate an error; also said in application to typewriters; type slug. 

  • A ship that sails slowly. 

  • The imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it. 

  • A solid block or piece of roughly shaped metal. 

  • Any of many terrestrial pulmonate gastropod mollusks, having no (or only a rudimentary) shell. 

  • An accessory to a diesel-electric locomotive, used to increase adhesive weight and allow full power to be applied at a lower speed. It has trucks with traction motors, but lacks a prime mover, being powered by electricity from the mother locomotive, and may or may not have a control cab. 

  • A stranger picked up as a passenger to enable legal use of high occupancy vehicle lanes. 

  • A hitchhiking commuter. 

  • A counterfeit coin, especially one used to steal from vending machines. 

  • A discrete mass of a material that moves as a unit, usually through another material. 

  • A shot of a drink, usually alcoholic. 

verb
  • To hit very hard, usually with the fist. 

  • To drink quickly; to gulp; to down. 

  • To take part in casual carpooling; to form ad hoc, informal carpools for commuting, essentially a variation of ride-share commuting and hitchhiking. 

  • To make sluggish. 

  • To become reduced in diameter, or changed in shape, by passing from a larger to a smaller part of the bore of the barrel. 

  • To load with a slug or slugs. 

smack

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

  • A group of jellyfish. 

  • 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. 

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

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. 

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