concord vs disaccord

concord

verb
  • To agree; to act together 

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. 

disaccord

verb
  • To fail to be in accord; to dissent. 

noun
  • The absence or reverse of accord. 

  • Disharmony. 

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