approbation vs flattery

approbation

noun
  • The act of approving; an assenting to the propriety of a thing with some degree of pleasure or satisfaction; approval, sanction, commendation or official recognition. 

flattery

noun
  • Excessive praise or approval, which is often insincere and sometimes contrived to win favour. 

  • An instance of excessive praise. 

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