cacophony vs consonance

cacophony

noun
  • A mix of discordant sounds; dissonance. 

consonance

noun
  • The repetition of consonant sounds, but not vowels as in assonance. 

  • Harmony; agreement; lack of discordance. 

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