attestation vs vow

attestation

noun
  • A confirmation or authentication. 

  • The process, performed by accountants or auditors, of providing independent opinion on published financial and other business information of a business, public agency, or other organization. 

  • A thing that serves to bear witness, confirm, or authenticate; validation, verification, documentation. 

  • An appearance in print or otherwise recorded on a permanent medium. 

vow

noun
  • A declaration or assertion. 

  • A solemn promise to perform some act, or behave in a specified manner, especially a promise to live and act in accordance with the rules of a religious order. 

verb
  • To declare publicly that one has made a vow, usually to show one's determination or to announce an act of retaliation. 

  • To make a vow; to promise. 

  • To make a vow regarding (something). 

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