bluster vs plain speaking

bluster

noun
  • A gust of wind. 

  • Pompous, officious talk. 

  • Fitful noise and violence. 

verb
  • To act or speak in an unduly threatening manner. 

  • To blow in strong or sudden gusts. 

  • To speak or protest loudly. 

plain speaking

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