betrothal vs congruity

betrothal

noun
  • The fact of being betrothed; a mutual promise, engagement, or contract for a future marriage between two people. 

  • The act of betrothing. 

congruity

noun
  • An instance or point of agreement or correspondence; a resemblance. 

  • The quality of agreeing; the quality of being suitable and appropriate. 

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