concord vs contention

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 

contention

noun
  • Competition by parts of a system or its users for a limited resource. 

  • Argument, contest, debate, strife, struggle. 

  • A point maintained in an argument, or a line of argument taken in its support; the subject matter of discussion of strife; a position taken or contended for. 

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