dialect vs slang

dialect

noun
  • A variety of a language that is characteristic of a particular area, community, or social group, differing from other varieties of the same language in relatively minor ways as regards grammar, phonology, and lexicon. 

  • A language existing only in an oral or non-standardized form, especially a language spoken in a developing country or an isolated region. 

  • A variant form of the vocalizations of a bird species restricted to a certain area or population. 

  • A variant of a non-standardized programming language. 

  • Language that is perceived as substandard or wrong. 

  • A lect (often a regional or minority language) as part of a group or family of languages, especially if they are viewed as a single language, or if contrasted with a standardized idiom that is considered the 'true' form of the language (for example, Cantonese as contrasted with Mandarin Chinese or Bavarian as contrasted with Standard German). 

slang

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

  • 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. 

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

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

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

verb
  • To sell (especially illegal drugs). 

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