approval vs confirmation

approval

noun
  • An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements. 

  • Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item. 

  • An expression of favorable acceptance and encouragement; a compliment that also condones. 

confirmation

noun
  • A verification that something is true or has happened. 

  • An official indicator that things will happen as planned. 

  • A ceremony of sealing and conscious acknowledgement of the faith in many Christian churches, typically around the ages of 14 to 18; considered a sacrament in some churches, including Catholicism, but not in most Protestant churches. 

  • An act whereby something conditional or voidable is made sure and unavoidable, especially the possession of an estate. 

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