imagery vs litotes

imagery

noun
  • Rhetorical decoration in writing or speaking; vivid descriptions presenting or suggesting images of sensible objects; figures in discourse. 

  • Imitation work. 

  • Images in general, or en masse. 

  • Unreal show; imitation; appearance. 

  • The work of the imagination or fancy; false ideas; imaginary phantasms. 

  • The work of one who makes images or visible representation of objects. 

litotes

noun
  • An ironic figure of speech whereby something is stated by denying its opposite, particularly the negation of a negative quality to say something positive. 

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