alliance vs concord

alliance

noun
  • Any union resembling that of families or states; union by relationship in qualities; affinity. 

  • Marriage. 

  • The persons or parties allied. 

  • The state of being allied. 

  • The act of allying or uniting. 

  • A union or connection of interests between families, states, parties, etc., especially between families by marriage and states by compact, treaty, or league. 

concord

noun
  • A state of agreement; harmony; union. 

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

  • 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 

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