confirmation vs testimonial

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. 

testimonial

noun
  • A statement, especially one given under oath; testimony 

  • A match played in tribute to a particular player (who sometimes receives a proportion of the gate money). 

  • A tribute given in appreciation of someone's service etc. 

  • A written recommendation of someone's worth or character 

adj
  • Serving as testimony. 

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