neologism vs slang

neologism

noun
  • A word or phrase which has recently been coined; a new word or phrase, or an existing one which has gained a new meaning. 

  • The introduction of new doctrine, for example in theology. 

  • The newly coined, meaningless words or phrases of someone with a psychosis, usually schizophrenia. 

  • The act or instance of coining, or uttering a new word. 

slang

noun
  • An item of slang; a slang word or expression. 

  • A curse word. 

  • The specialized language of a social group, sometimes used to conceal one's meaning from outsiders; cant. 

  • A particular variety of slang; the slang used by a particular group. 

  • Language outside of conventional usage and in the informal register. 

  • Language that is unique to a particular profession or subject; jargon. 

  • Any long, narrow piece of land; a promontory. 

verb
  • To sell (especially illegal drugs). 

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