congruity vs dissimilitude

congruity

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

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

dissimilitude

noun
  • The quality of being diverse or different; lack of resemblance. 

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