confederation vs matrimony

confederation

noun
  • The act of forming an alliance. 

  • A union or alliance of states or political organizations. 

matrimony

noun
  • A particular solitaire card game using two decks of cards. 

  • Marriage; the state of being married. 

  • The ceremony of marriage. 

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