approbation vs popularity

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. 

popularity

noun
  • The quality or state of being popular; especially, the state of being esteemed by, or of being in favor with, the people at large 

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