fluency vs rhetoric

fluency

noun
  • The quality of being fluent in a language; A person's command of a particular language. 

  • The quality of smoothness of flow. 

  • The quality of consistently applying skill correctly in the manner of one well-practiced at it, requiring little deliberate thought to perform without mistakes 

rhetoric

noun
  • The art of using language, especially public speaking, as a means to persuade. 

  • Meaningless language with an exaggerated style intended to impress. 

adj
  • Synonym of rhetorical. 

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