accordance vs concomitance

accordance

noun
  • Agreement; harmony; conformity; compliance. 

  • The act of granting something. 

concomitance

noun
  • occurrence or existence together or in connection with one another, coexistence 

  • A concomitant. 

  • The Roman Catholic doctrine of the existence of the entire body of Christ in the Eucharist, under each element, so that the body and blood are both received by communication in one kind only. 

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