locution vs pronunciation

locution

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

  • 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. 

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

pronunciation

noun
  • The act of pronouncing or uttering a vocable. 

  • The formal or informal way in which a word is made to sound when spoken. 

  • The way in which the words of a language are made to sound when speaking. 

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