locution vs slanguage

locution

noun
  • The use of a word or phrase in an unusual or specialized way. 

  • A phrase or expression connected to an individual or a group of individuals through repeated usage. 

  • A supernatural revelation where a religious figure, statue or icon speaks, usually to a saint. 

  • Style of discourse or usage, or any particular utterance in such style. 

slanguage

noun
  • A particular vernacular or vocabulary of slang; the jargon or lingo of a particular group. 

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