Conventual vs doctrinal

Conventual

noun
  • A member of one of the two divisions of the Franciscans, following a mitigated rule, the other being the Observants. 

doctrinal

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

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

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