pronunciation vs subdialect

pronunciation

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

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

  • The act of pronouncing or uttering a vocable. 

subdialect

noun
  • A subdivision of a dialect 

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