approbative vs recommendatory

approbative

adj
  • Expressing approval. 

  • Sanctioning officially, giving authorization or approval to something. 

noun
  • A word or grammatical form which denotes a positive affect expressing the appreciation or approval of the speaker. 

recommendatory

adj
  • Of or pertaining to a recommendation 

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