lack of congruence vs repugnancy

lack of congruence

repugnancy

noun
  • The quality of being repugnant: (logical) opposition, contradiction, incompatibility. 

  • The quality of being repugnant: offensiveness, repulsion. 

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