discordance vs variance

discordance

noun
  • A state of being discordant; disagreement, inconsistency. 

  • The presence of a specific genetic trait in only one of a set of clones (or identical twins). 

  • Discordance of sounds; dissonance. 

variance

noun
  • The state of differing or being in conflict. 

  • A discrepancy between two legal documents. 

  • A departure from a cause of action originally in a complaint. 

  • An official permit to do something that is ordinarily forbidden by regulations. 

  • The act of varying or the state of being variable. 

  • The number of degrees of freedom in a system. 

  • Covariance and contravariance generally. 

  • A difference between what is expected and what is observed; deviation. 

  • The second central moment in probability. 

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