alliance vs severance

alliance

noun
  • 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. 

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

severance

noun
  • A separation. 

  • The act of severing or the state of being severed. 

  • A severance payment. 

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