alliance vs bloc

alliance

noun
  • The persons or parties allied. 

  • Marriage. 

  • 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. 

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

bloc

noun
  • A group of voters or politicians who share common goals. 

  • A group of countries acting together for political or economic goals, an alliance: e.g., the eastern bloc, the western bloc, a trading bloc, the Eurozone, the European Union. 

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