consonance vs level set

consonance

noun
  • Harmony; agreement; lack of discordance. 

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

level set

noun
  • A state of mutual understanding among parties 

  • An event consisting of level setting 

  • The set of values x for which a real-valued function f(x) is equal to a given constant. 

verb
  • To establish a baseline of mutual understanding 

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