endorsement vs sponsorship

endorsement

noun
  • Sponsorship, in means of money, by a company, business or enterprise. 

  • The act or quality of endorsing 

  • An amendment or annotation to an insurance contract or other official document (such as a driving licence). 

  • An instructor's signed acknowledgement of time practising specific flying skills. 

  • Permission to carry out a specific skill or application in a field in which the practitioner already has a general licence. 

  • Support from an important, renowned figure of a media (celebrity, politics, sports, etc.), to get back up. 

sponsorship

noun
  • The state or practice of being a sponsor. 

  • The aid or support provided by a sponsor; backing or patronage. 

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