diplomatic vs doctrinal

diplomatic

adj
  • Relating to diplomatics, or the study of old texts; paleographic. 

  • Exhibiting diplomacy; exercising tact or courtesy; using discussion to avoid hard feelings, fights or arguments. 

  • describing a publication of a text which follows a single basic manuscript, but with variants in other manuscripts noted in the critical apparatus 

  • Concerning the relationships between the governments of countries. 

noun
  • The science of diplomas, or the art of deciphering ancient writings and determining their age, authenticity, etc.; paleography. 

doctrinal

adj
  • Of, relating to, involving, belonging to or concerning a doctrine. 

noun
  • A matter of doctrine, or system of doctrines. 

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