enunciate vs mussitate

enunciate

verb
  • To articulate, pronounce. 

  • To make a definite or systematic statement of. 

  • To announce, proclaim. 

  • To make sounds clearly. 

mussitate

verb
  • To say (words, etc.) indistinctly; to mutter. 

  • To talk indistinctly; to mutter. 

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