approbative vs approving

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. 

approving

adj
  • Expressing approbation; commending 

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