concord vs consistency

concord

noun
  • Agreement of words with one another, in gender, number, person or case. 

  • A state of agreement; harmony; union. 

  • An agreeable combination of tones simultaneously heard; a consonant chord; consonance; harmony. 

  • A variety of sweet American grape, with large dark blue (almost black) grapes in compact clusters; a Concord grape. 

verb
  • To agree; to act together 

consistency

noun
  • Correspondence or compatibility. 

  • Freedom from contradiction; the state of a system of axioms such that none of the propositions deduced from them are mutually contradictory. 

  • Reliability or uniformity; the quality of being consistent. 

  • The degree of viscosity of something. 

  • Local coherence. 

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